1000 round number
1002 sphenic number, Mertens function zero, abundant number
1005 Mertens function zero
1008 divisible by the number of primes below it
1009 first prime above 1000
1010 Mertens function zero
1013 Sophie Germain prime, centered square number, Mertens function zero
1014 Mertens function zero
1015 square pyramidal number
1016 member of the Mian–Chowla sequence
1017 Brick Squad
1018 Mertens function zero
1019 Sophie Germain prime, safe prime
1020 polydivisible number
1023 the highest number one can count to on one's fingers using binary; also the magic number used in Global Positioning System signals
1024 , the number of bytes in a kilobyte (in 1999, the IEC coined kibibyte to use for 1024 with kilobyte being 1000, but this convention has not been widely adopted)
1027 sum of the squares of the first eight primes; can be written from base 2 to base 18 using only the digits 0 to 9.
1028 sum of totient function for first 58 integers; can be written from base 2 to base 18 using only the digits 0 to 9.
1029 can be written from base 2 to base 18 using only the digits 0 to 9.
1031 Sophie Germain prime
1033 locale ID of English (United States) in (some version of) Windows.(VS.80).aspx.
1035 triangular number, hexagonal number
1036 4444 in base-6
1049 Sophie Germain prime, highly cototient number
1051 centered pentagonal number
1055 555 in base-14
1056 pronic number
1060 sum of the first 25 primes
1064 888 in base-11
1071 heptagonal number
1072 centered heptagonal number
1079 every positive integer is the sum of at most 1079 tenth powers.
1080 pentagonal number
1081 triangular number, member of Padovan sequence
1086 Smith number, sum of totient function for first 59 integers
1087 Chen prime, cousin prime, lucky prime, Kynea number
1089 , nonagonal number, centered octagonal number
1091 cousin prime and twin prime
1092 divisible by the number of primes below it
1093 the smallest Wieferich prime (the only other known Wieferich prime is 3511), twin prime and star number
1098 666 in base-13
1099 777 in base-12
1102 sum of totient function for first 60 integers
1103 Sophie Germain prime, balanced prime
1104 Keith number
1105 Carmichael number, magic constant of n × n normal magic square and n-queens problem for n = 13, decagonal number, centered square number, 1105 = 332 + 42 = 322 + 92 = 312 + 122 = 232 + 242
1111 repdigit
1116 divisible by the number of primes below it
1122 pronic number, divisible by the number of primes below it
1123 balanced prime
1124 Leyland number
1125 500 in base-15
1128 triangular number, hexagonal number, divisible by the number of primes below it
1134 divisible by the number of primes below it
1138 recurring number in the works of George Lucas and his companies, beginning with his first feature film – THX 1138; particularly, a special code for Easter eggs on Star Wars DVDs.
1140 tetrahedral number
1152 highly totient number
1153 Proth prime
1156 , octahedral number, centered pentagonal number
1159 member of the Mian–Chowla sequence
1161 sum of the first 26 primes
1162 pentagonal number, sum of totient function for first 61 integers
1169 highly cototient number
1170 highest possible score in a National Academic Quiz Tournaments (NAQT) match
1176 triangular number
1177 heptagonal number
1183 700 in base-13
1184 amicable number with 1210
1187 safe prime, Stern prime, balanced prime
1190 pronic number
1192 sum of totient function for first 62 integers
1197 999 in base-11
1198 centered heptagonal number
1200 the number of households the Nielsen ratings sample
1201 centered square number
1205 555 in base-15
1210 amicable number with 1184
1216 nonagonal number
1217 Proth prime
1219 Mertens function zero
1220 Mertens function zero
1223 Sophie Germain prime, balanced prime
1225 , triangular number, square triangular number, hexagonal number, centered octagonal number
1228 sum of totient function for first 63 integers
1229 Sophie Germain prime
1233
1234 consecutive digits
1240 square pyramidal number
1241 centered cube number
1242 decagonal number
1247 pentagonal number
1249 emirp, trimorphic number
1250 20000 in base-5
1255 Mertens function zero
1256 Mertens function zero
1258 Mertens function zero
1259 highly cototient number
1260 highly composite number, pronic number, the smallest vampire number, sum of totient function for first 64 integers, this number appears twice in the Book of Revelation
1261 star number, Mertens function zero
1264 sum of the first 27 primes
1266 centered pentagonal number, Mertens function zero
1270 Mertens function zero
1275 triangular number, sum of the first 50 natural numbers
1279 Mertens function zero
1280 Mertens function zero
1281 777 in base-13
1282 Mertens function zero
1283 safe prime
1285 Mertens function zero
1288 heptagonal number
1289 Sophie Germain prime, Mertens function zero
1291 Mertens function zero
1292 Mertens function zero
1295 5555 in base-6
1296 64, 362, sum of the cubes of the first eight positive integers, the number of rectangles on a normal 8 × 8 chessboard
1297 Mertens function zero
1299 Mertens function zero
1300 Sum of the first 4 fifth powers, mertens function zero, largest possible win margin in an NAQT match
1301 centered square number
1302 Mertens function zero
1306 Mertens function zero
1307 safe prime
1308 sum of totient function for first 65 integers
1309 the first sphenic number followed by two consecutive such number
1312 member of the Mian–Chowla sequence
1318 Mertens function zero
1319 safe prime
1325 Markov number
1326 triangular number, hexagonal number, Mertens function zero
1327 first prime followed by 32 consecutive composite numbers
1328 sum of totient function for first 66 integers
1329 Mertens function zero
1330 tetrahedral number, forms a Ruth–Aaron pair with 1331 under second definition
1331 113, centered heptagonal number, forms a Ruth–Aaron pair with 1330 under second definition. This is the only cube of the form x2+x-1, for x=36.
1332 pronic number
1335 pentagonal number, Mertens function zero
1336 Mertens function zero
1337 Used in the novel form of spelling called leet
1338 Mertens function zero
1342 Mertens function zero
1350 nonagonal number
1352 800 in base-13
1365 pentatope number, binary 10101010101
1367 safe prime, balanced prime
1369 372, centered octagonal number
1371 sum of the first 28 primes
1372 4000 in base-7
1378 triangular number
1379 magic constant of n × n normal magic square and n-queens problem for n = 14.
1381 centered pentagonal number
1387 5th Fermat pseudoprime of base 2, 22nd centered hexagonal number and the 19th decagonal number, second Super-Poulet number.
1394 sum of totient function for first 67 integers
1395 vampire number, member of the Mian–Chowla sequence
1404 heptagonal number
1405 , , centered square number
1406 pronic number, semi-meandric number
1409 Sophie Germain prime, smallest number whose eighth power is the sum of 8 eighth powers, Proth prime
1413 999 in base-12
1419 Zeisel number
1425 self-descriptive number in base 5
1426 sum of totient function for first 68 integers, pentagonal number
1430 Catalan number
1431 triangular number, hexagonal number
1432 member of Padovan sequence
1433 Typical port used for remote connections to Microsoft SQL Server databases
1435 vampire number; the standard railway gauge in millimetres, equivalent to 4' 8½"
1439 Sophie Germain prime, safe prime
1440 a highly totient number and a 481-gonal number. Also, the number of minutes in one day, the blocksize of a standard 3.5" floppy disk, and the horizontal resolution of WXGA(II) computer displays
1441 star number
1444 , smallest pandigital number in Roman numerals
1446 666 in base-15
1451 Sophie Germain prime
1458 2000000 in base-3
1464 1111 in base-11
1469 octahedral number, highly cototient number
1470 pentagonal pyramidal number, sum of totient function for first 69 integers
1471 centered heptagonal number
1477 777 in base-14
1480 sum of the first 29 primes
1481 Sophie Germain prime
1482 pronic number
1485 triangular number
1487 safe prime
1490 tetranacci number
1491 nonagonal number, Mertens function zero
1492 Mertens function zero
1493 Stern prime
1494 sum of totient function for first 70 integers
1496 square pyramidal number
1499 Sophie Germain prime
1501 centered pentagonal number
1511 Sophie Germain prime, balanced prime
1513 centered square number
1518 Mertens function zero
1519 Mertens function zero
1520 pentagonal number, Mertens function zero, forms a Ruth–Aaron pair with 1521 under second definition
1521 , Mertens function zero, centered octagonal number, forms a Ruth–Aaron pair with 1520 under second definition
1523 Mertens function zero, safe prime, member of the Mian–Chowla sequence
1524 Mertens function zero
1525 heptagonal number, Mertens function zero
1527 Mertens function zero
1528 Mertens function zero
1530 vampire number
1531 Mertens function zero
1532 Mertens function zero
1535 Thabit number
1536 3000 in base-8
1537 Keith number, Mertens function zero
1540 triangular number, hexagonal number, decagonal number, tetrahedral number
1543 Mertens function zero
1544 Mertens function zero
1546 Mertens function zero
1555 11111 in base-6
1556 sum of the squares of the first nine primes
1559 Sophie Germain prime
1560 pronic number
1562 22222 in base-5
1564 sum of totient function for first 71 integers
1568 800 in base-14
1572 member of the Mian–Chowla sequence
1575 odd abundant number
1583 Sophie Germain prime
1588 sum of totient function for first 72 integers
1593 sum of the first 30 primes
1596 triangular number
1597 Fibonacci number, Markov number, Prime number, emirp
1600 , street number on Pennsylvania Avenue of the White House, Meters; Common High School Track Event, perfect score on SAT
1601 Sophie Germain prime, Proth prime, the novel 1601 (Mark Twain)
1617 pentagonal number
1618 centered heptagonal number
1619 safe prime
1625 centered square number
1626 centered pentagonal number
1633 star number
1638 harmonic divisor number
1639 nonagonal number
1640 pronic number
1647 999 in base-13
1649 highly cototient number, Leyland number
1651 heptagonal number
1653 triangular number, hexagonal number
1657 cuban prime
1660 sum of totient function for first 73 integers
1666 largest efficient pandigital number in Roman numerals (each symbol occurs exactly once)
1679 highly cototient number, semiprime (23 × 73, see also Arecibo message)
1680 highly composite number
1681 , smallest number yielded by the formula that is not a prime; centered octagonal number
1682 member of a Ruth–Aaron pair (first definition)
1683 member of a Ruth–Aaron pair (first definition)
1687 777 in base-15
1688 888 in base-14
1695 magic constant of n × n normal magic square and n-queens problem for n = 15.
1696 sum of totient function for first 74 integers
1701 decagonal number, hull number of the U.S.S. Enterprise on Star Trek
1705 tribonacci number
1709 first of a sequence of eight primes formed by adding 57 in the middle. 1709, 175709, 17575709, 1757575709, 175757575709, 17575757575709, 1757575757575709 and 175757575757575709 are all prime, but 17575757575757575709 = 232433 × 75616446785773
1711 triangular number
1715 5000 in base-7
1717 pentagonal number
1720 sum of the first 31 primes
1722 Giuga number, pronic number
1728 the quantity expressed as 1000 in duodecimal, that is, the cube of twelve (called a great gross), and so, the number of cubic inches in a cubic foot
1729 taxicab number, Carmichael number, Zeisel number, centered cube number, Hardy–Ramanujan number. In the decimal expansion of e the first time all 10 digits appear in sequence starts at the 1729th decimal place. In 1979 the rock musical Hair closed on Broadway in New York City after 1729 performances.
1733 Sophie Germain prime
1736 sum of totient function for first 75 integers
1741 centered square number
1747 balanced prime
1753 balanced prime
1755 3333 in base-8
1756 centered pentagonal number
1764
1770 triangular number, hexagonal number, Town of Seventeen Seventy in Australia
1771 tetrahedral number
1772 centered heptagonal number, sum of totient function for first 76 integers
1782 heptagonal number
1785 square pyramidal number
1791 largest natural number that cannot be expressed as a sum of at most four hexagonal numbers.
1792 700 in base-16
1794 nonagonal number
1800 pentagonal pyramidal number, also, in da Ponte's Don Giovanni, the number of women Don Giovanni had slept with so far when confronted by Donna Elvira, according to Leporello's tally
1801 cuban prime
1806 pronic number, product of first four terms of Sylvester's sequence, primary pseudoperfect number
1807 fifth term of Sylvester's sequence
1811 Sophie Germain prime
1820 pentagonal number, pentatope number
1821 member of the Mian–Chowla sequence
1823 safe prime
1827 vampire number
1828 meandric number, open meandric number
1830 triangular number
1832 sum of totient function for first 77 integers
1834 octahedral number, sum of the cubes of the first five primes
1836 factor by which a proton is more massive than an electron
1837 star number
1841 Mertens function zero
1843 Mertens function zero
1844 Mertens function zero
1845 Mertens function zero
1849 , centered octagonal number
1851 sum of the first 32 primes
1853 Mertens function zero
1854 Mertens function zero
1856 sum of totient function for first 78 integers
1857 Mertens function zero
1861 centered square number, Mertens function zero
1862 Mertens function zero, forms a Ruth–Aaron pair with 1863 under second definition
1863 Mertens function zero, forms a Ruth–Aaron pair with 1862 under second definition
1864 Mertens function zero
1866 Mertens function zero
1870 decagonal number
1875 30000 in base-5
1885 Zeisel number
1889 Sophie Germain prime, highly cototient number
1891 triangular number, hexagonal number, centered pentagonal number
1892 pronic number
1896 member of the Mian–Chowla sequence
1897 member of Padovan sequence
1899 999 in base-14
1900 1900 (film) or Novecento, 1977 movie
1901 Sophie Germain prime
1907 safe prime, balanced prime
1909 hyperperfect number
1911 777 in base-16
1918 heptagonal number
1926 pentagonal number
1928 888 in base-15
1929 Mertens function zero
1931 Sophie Germain prime
1933 centered heptagonal number, prime number
1934 sum of totient function for first 79 integers
1936
1938 Mertens function zero
1951 cuban prime, prime followed by a prime gap of 22.
1953 triangular number
1956 nonagonal number
1966 sum of totient function for first 80 integers
1973 Sophie Germain prime
1980 pronic number
1984 11111000000 in binary, see also: 1984 (disambiguation)
1985 centered square number
1988 sum of the first 33 primes
2000 round number
2001 sphenic number
2003 Sophie Germain prime and the smallest prime number in 2000's
2005 A vertically symmetric number
2009
2011 Sexy prime number. Also, sum of eleven consecutive primes: 2011=157+163+167+173+179+181+191+193+197+199+211.
2015 Lucas–Carmichael number
2016 triangular number
2017 Mertens function zero. (2011, 2017) is a sexy prime pair.
2020 sum of the totient function for the first 81 integers
2024 tetrahedral number
2025 , sum of the cubes of the first nine integers, centered octagonal number
2027 safe prime
2029 member of the Mian–Chowla sequence
2030 ,
2031 centered pentagonal number
2039 Sophie Germain prime, safe prime
2047 super-Poulet number, Woodall number, decagonal number. Also, 2047 = 211 − 1 = 23 × 89 and is the first Mersenne number that is composite for a prime exponent.
2048 power of two
2056 magic constant of n×n normal magic square and n-queens problem for n = 16.
2058 6000 in base-7
2060 sum of the totient function for the first 82 integers
2063 Sophie Germain prime, safe prime
2069 Sophie Germain prime
2070 pronic number
2080 triangular number
2093 Mertens function zero
2095 Mertens function zero
2096 Mertens function zero
2097 Mertens function zero
2099 Mertens function zero, safe prime, highly cototient number
2100 Mertens function zero
2101 centered heptagonal number
2107 member of a Ruth–Aaron pair with 2108 (first definition)
2108 member of a Ruth–Aaron pair with 2107 (first definition)
2109 square pyramidal number
2112 The break-through album of the band Rush
2113 Mertens function zero, Proth prime, centered square number
2116
2117 Mertens function zero
2119 Mertens function zero
2120 Mertens function zero
2122 Mertens function zero
2125 nonagonal number
2127 sum of the first 34 primes
2129 Sophie Germain prime
2135 Mertens function zero
2136 Mertens function zero
2138 Mertens function zero
2141 Sophie Germain prime
2142 sum of the totient function for the first 83 integers
2143 almost exactly 22π4
2145 triangular number
2162 pronic number
2166 sum of the totient function for the first 84 integers
2169 Leyland number
2171 Mertens function zero
2172 Mertens function zero
2175 smallest number requiring 143 seventh powers for Waring representation
2176 pentagonal pyramidal number, centered pentagonal number
2178 reverses when multiplied by 4
2179 Wedderburn–Etherington number
2184 888 in base-16
2186 2222222 in base-3
2187 , vampire number, perfect totient number
2188 Motzkin number
2197
2199 perfect totient number
2201 only non-palindromic number whose cube is palindromic, also no fourth or higher powers are palindromic for non-palindromic numbers
2205 odd abundant number
2207 safe prime, Lucas prime
2208 Keith number
2209 , centered octagonal number
2211 triangular number
2222 repdigit
2223 Kaprekar number
2230 sum of the totient function for the first 85 integers
2232 decagonal number
2245 centered square number
2254 member of the Mian–Chowla sequence
2255 octahedral number
2256 pronic number
2269 cuban prime
2272 sum of the totient function for the first 86 integers
2273 Sophie Germain prime
2276 sum of the first 35 primes, centered heptagonal number
2278 triangular number
2287 balanced prime
2294 Mertens function zero
2295 Mertens function zero
2296 Mertens function zero
2299 member of a Ruth–Aaron pair with 2300 (first definition)
2300 tetrahedral number, member of a Ruth–Aaron pair with 2299 (first definition)
2301 nonagonal number
2304
2306 Mertens function zero
2309 primorial prime, Mertens function zero, highly cototient number
2310 fifth primorial
2311 primorial prime
2321 Mertens function zero
2322 Mertens function zero
2326 centered pentagonal number
2328 sum of the totient function for the first 87 integers
2331 centered cube number
2338 Mertens function zero
2339 Sophie Germain prime
2340 4444 in base-8
2343 33333 in base-5
2345 consecutive digits
2346 triangular number
2351 Sophie Germain prime
2352 pronic number
2357 Smarandache–Wellin prime
2368 sum of the totient function for the first 88 integers
2378 Pell number
2379 member of the Mian–Chowla sequence
2380 1111 in base-13
2381 centered square number
2393 Sophie Germain prime
2397 sum of the squares of the first ten primes
2399 Sophie Germain prime
2400 perfect score on SAT tests administered after 2005
2401 , , centered octagonal number
2415 triangular number
2417 balanced prime
2425 decagonal number
2427 sum of the first 36 primes
2431 product of three consecutive primes
2437 cuban prime
2447 safe prime
2450 pronic number
2456 sum of the totient function for the first 89 integers
2457 999 in base-16
2458 centered heptagonal number
2459 Sophie Germain prime, safe prime
2460 3333 in base-9
2465 magic constant of n×n normal magic square and n-queens problem for n = 17, Carmichael number
2470 square pyramidal number
2480 sum of the totient function for the first 90 integers
2481 centered pentagonal number
2484 nonagonal number
2485 triangular number
2491 member of Ruth–Aaron pair with 2492 under second definition
2492 member of Ruth–Aaron pair with 2491 under second definition
2500
2501 Mertens function zero
2502 Mertens function zero
2510 member of the Mian–Chowla sequence
2513 member of the Padovan sequence
2517 Mertens function zero
2519 the smallest number congruent to 1 (mod 2), 2 (mod 3), 3 (mod 4), ..., 9 (mod 10)
2520 superior highly composite number; smallest number divisible by numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 12 ; colossally abundant number; Harshad number in several bases. It is also the highest number with more divisors than any number less than double itself.(sequence A072938 in OEIS) Not only is it the 7th (and last) number with more divisors than any number double itself but it also the 7th number that is highly composite and the lowest common multiple of a consecutive set of integers from 1 (sequence A095921 in OEIS) which is a property the previous number with this pattern of divisors does not have (360). That is, although 360 and 2520 both have more divisors than any number twice themselves, 2520 is the lowest number divisible by both 1 to 9 and 1 to 10, whereas 360 is not the lowest number divisible by 1 to 6 (which 60 is) and is not divisible by 1 to 7 (which 420 is). It is also the 6th and largest highly composite number that is a divisor of every higher highly composite number.(sequence A106037 in OEIS)
2521 centered square number
2522 Mertens function zero
2523 Mertens function zero
2524 Mertens function zero
2525 Mertens function zero
2530 Mertens function zero, Leyland number
2533 Mertens function zero
2537 Mertens function zero
2538 Mertens function zero
2543 Sophie Germain prime
2549 Sophie Germain prime
2550 pronic number
2552 sum of the totient function for the first 91 integers
2556 triangular number
2560 5000 in base-8
2567 Mertens function zero
2568 Mertens function zero. Also number of digits in the decimal expansion of 1000!, or the product of all natural numbers from 1 to 1000.
2570 Mertens function zero
2579 safe prime
2580 Keith number
2584 Fibonacci number, sum of the first 37 primes
2592 20000 in base-6
2596 sum of the totient function for the first 92 integers
2600 tetrahedral number, member of a Ruth–Aaron pair with 2601 (first definition)
2601 , member of a Ruth–Aaron pair with 2600 (first definition)
2620 amicable number with 2924
2626 decagonal number
2628 triangular number
2632 number of consecutive baseball games played by Cal Ripken, Jr.
2641 centered pentagonal number
2647 centered heptagonal number
2652 pronic number
2656 sum of the totient function for the first 93 integers
2662 2000 in base-11
2665 centered square number
2674 nonagonal number
2677 balanced prime
2680 number of 11-queens problem solutions
2689 Mertens function zero, Proth prime
2693 Sophie Germain prime
2699 Sophie Germain prime
2701 triangular number, super-Poulet number
2702 sum of the totient function for the first 94 integers
2704
2728 Kaprekar number
2729 highly cototient number
2730 binary 101010101010
2731 Wagstaff prime
2736 octahedral number
2741 Sophie Germain prime
2744
2747 sum of the first 38 primes
2753 Sophie Germain prime, Proth prime
2756 pronic number
2774 sum of the totient function for the first 95 integers
2775 triangular number
2780 member of the Mian–Chowla sequence
2783 member of a Ruth–Aaron pair with 2784 (first definition)
2784 member of a Ruth–Aaron pair with 2783 (first definition)
2791 cuban prime
2801 first base 7 repunit prime
2806 centered pentagonal number, sum of the totient function for the first 96 integers
2809 , centered octagonal number
2813 centered square number
2819 Sophie Germain prime, safe prime
2821 Carmichael number
2835 odd abundant number, decagonal number
2843 centered heptagonal prime
2850 triangular number
2862 pronic number
2870 square pyramidal number
2871 nonagonal number
2872 tetranacci number
2879 safe prime
2897 Markov number
2902 sum of the totient function for the first 97 integers
2903 Sophie Germain prime, safe prime, balanced prime
2914 sum of the first 39 primes
2915 Lucas–Carmichael number
2916
2924 amicable number with 2620
2925 magic constant of n×n normal magic square and n-queens problem for n = 18, tetrahedral number, member of the Mian-Chowla sequence
2926 triangular number
2928 2222 in base-11
2939 Sophie Germain prime
2944 sum of the totient function for the first 98 integers
2955 1111 in base-14
2963 Sophie Germain prime, safe prime, balanced prime
2965 greater of second pair of Smith brothers, centered square number
2969 Sophie Germain prime
2970 harmonic divisor number, pronic number
2976 centered pentagonal number
2997 chiliagonal number
2999 safe prime
3000 round number
3003 triangular number, only number known to appear eight times in Pascal's triangle; no number is known to appear more than eight times other than 1. (see Singmaster's conjecture)
3023 84th Sophie Germain prime, 51st safe prime
3025 55 2, sum of the cubes of the first ten integers, centered octagonal number
3045 sum of the integers 196 to 210 and sum of the integers 211 to 224
3046 centered heptagonal number
3052 decagonal number
3059 centered cube number
3063 perfect totient number
3071 Thabit number
3072 300000 in base-4
3075 nonagonal number
3078 18th pentagonal pyramidal number
3080 pronic number
3081 triangular number, 497th sphenic number
3087 sum of first 40 primes
3110 22222 in base-6
3119 safe prime
3121 centered square number
3124 44444 in base-5
3125 55
3136 562, tribonacci number
3137 Proth prime
3149 highly cototient number
3155 member of the Mian–Chowla sequence
3160 triangular number
3167 safe prime
3169 Cuban prime of the form x = y + 1
3192 pronic number
3203 safe prime
3240 triangular number
3248 member of a Ruth-Aaron pair with 3249 under second definition, largest number whose factorial is less than 1010000 – hence its factorial is the largest certain advanced computer programs can handle.
3249 57 2, centered octagonal number, member of a Ruth–Aaron pair with 3248 under second definition
3256 centered heptagonal number
3266 sum of first 41 primes, 523rd sphenic number
3276 tetrahedral number
3277 5th super-Poulet number, decagonal number
3280 11111111 in base-3
3281 octahedral number, centered square number
3286 nonagonal number
3299 85th Sophie Germain prime
3306 pronic number
3307 balanced prime
3313 balanced prime
3321 triangular number
3329 86th Sophie Germain prime, Proth prime, member of the Padovan sequence
3333 repdigit
3354 member of the Mian–Chowla sequence
3358 sum of the squares of the first eleven primes
3359 87th Sophie Germain prime, highly cototient number
3364 582
3375 15th cube
3389 88th Sophie Germain prime
3403 triangular number
3413 89th Sophie Germain prime
3422 pronic number, 553rd sphenic number, melting point of tungsten in degrees Celsius
3435 a perfect digit-to-digit invariant, equal to the sum of its digits to their own powers (33 + 44 + 33 + 55 = 3435)
3439 magic constant of n×n normal magic square and n-queens problem for n = 19.
3445 centered square number
3447 sum of first 42 primes
3449 90th Sophie Germain prime
3456 consecutive digits
3457 Proth prime
3467 safe prime
3469 Cuban prime of the form x = y + 2
3473 centered heptagonal number
3481 592, centered octagonal number
3486 triangular number
3491 91st Sophie Germain prime
3504 nonagonal number
3510 decagonal number
3511 largest known Wieferich prime
3539 92nd Sophie Germain prime
3540 pronic number
3569 highly cototient number
3570 triangular number
3571 500th prime, Cuban prime of the form x = y + 1, 17th Lucas number, 4th balanced prime of order 4.
3584 7000 in base-8
3591 member of the Mian–Chowla sequence
3593 93rd Sophie Germain prime
3600 602, number of seconds in an hour, 1201-gonal number
3610 19th pentagonal pyramidal number
3613 centered square number
3616 1111 in base-15
3623 94th Sophie Germain prime, safe prime
3637 balanced prime
3638 sum of first 43 primes, 599th sphenic number
3645 5000 in base-9
3654 tetrahedral number
3655 triangular number, 601st sphenic number
3660 pronic number
3684 13th Keith number
3697 centered heptagonal number
3721 612, centered octagonal number
3729 nonagonal number
3733 balanced prime
3741 triangular number, 618th sphenic number
3751 decagonal number
3761 95th Sophie Germain prime
3770 2222 in base-12
3779 96th Sophie Germain prime, safe prime
3782 pronic number, 623rd sphenic number
3785 centered square number
3797 member of the Mian–Chowla sequence
3803 97th Sophie Germain prime, safe prime
3821 98th Sophie Germain prime
3828 triangular number
3831 sum of first 44 primes
3844 622
3851 99th Sophie Germain prime
3863 100th Sophie Germain prime
3865 greater of third pair of Smith brothers
3888 longest number when expressed in Roman numerals I, V, X, L, C, D, and M (MMMDCCCLXXXVIII)
3889 Cuban prime of the form x = y + 2
3894 octahedral number
3906 pronic number
3911 101st Sophie Germain prime
3916 triangular number
3925 centered cube number
3926 12th open meandric number, 654th sphenic number
3928 centered heptagonal number
3947 safe prime
3961 nonagonal number, centered square number
3967 Carol number
3969 632, centered octagonal number
3989 highly cototient number
3993 3000 in base-11
3998 member of the Mian–Chowla sequence
3999 largest number properly expressible using Roman numerals I, V, X, L, C, D, and M (MMMCMXCIX)
4000 (four thousand) is the natural number following 3999 and preceding 4001. It is a decagonal number
4005 triangular number
4007 safe prime
4010 magic constant of n×n normal magic square and n-queens problem for n = 20.
4013 balanced prime
4019 Sophie Germain prime
4028 sum of the first 45 primes
4030 third weird number
4031 sum of the cubes of the first six primes
4032 pronic number
4033 sixth super-Poulet number; strong pseudoprime in base 2
4060 tetrahedral number
4073 Sophie Germain prime
4079 safe prime
4092 an occasional glitch in the game The Legend of Zelda: Ocarina of Time causes the Gossip Stones to say this number
4095 triangular number, odd abundant number, Mersenne number
4096 power of two ; ; 16th cube; smallest number with exactly 13 divisors; a superperfect number
4100 5555 in base-9
4104 (taxicab number)
4127 safe prime
4139 safe prime
4140 Bell number
4141 centered square number
4147 smallest cyclic number in duodecimal
4160 pronic number
4166 centered heptagonal number, 7! − 6! − 5! − 4! − 3! − 2! − 1! − 0!
4167 7! − 6! − 5! − 4! − 3! − 2! − 1!
4168 7! − 6! − 5! − 4! − 3! − 2!
4170 7! − 6! − 5! − 4! − 3!
4176 7! − 6! − 5! − 4!
4181 Fibonacci number, Markov number
4186 triangular number
4187 factor of R13. Also record number of wickets taken in first-class cricket by Wilfred Rhodes.
4199 highly cototient number, product of three consecutive primes
4200 nonagonal number, pentagonal pyramidal number, 7! − 6! − 5!
4210 11th semi-meandric number
4211 Sophie Germain prime
4219 cuban prime of the form x = y + 1
4223 Kynea number
4225 , centered octagonal number
4227 sum of the first 46 primes
4240 Leyland number
4257 decagonal number
4259 safe prime
4271 Sophie Germain prime
4278 triangular number
4283 safe prime
4289 highly cototient number
4290 pronic number
4320 7! − 6!
4321 consecutive digits
4324 23rd square pyramidal number
4325 centered square number
4349 Sophie Germain prime
4356 , sum of the cubes of the first eleven integers
4359 perfect totient number
4369 seventh super-Poulet number
4371 triangular number
4373 Sophie Germain prime
4374 20000000 in base-3
4375 perfect totient number (the smallest not divisible by 3)
4391 Sophie Germain prime
4392 3333 in base-11
4394 2000 in base-13
4397 Year of Comet Hale–Bopp's return, a prime number
4400 the number of missing persons in the sci-fi show The 4400
4409 Sophie Germain prime, highly cototient number, balanced prime
4411 centered heptagonal number
4421 alternating factorial
4422 pronic number
4438 sum of the first 47 primes
4444 repdigit
4446 nonagonal number
4447 cuban prime of the form x = y + 1
4457 balanced prime
4465 triangular number
4481 Sophie Germain prime
4489 , centered octagonal number
4495 tetrahedral number
4503 largest number not the sum of four or fewer squares of composites
4505 fifth Zeisel number
4513 centered square number
4522 decagonal number
4547 safe prime
4556 pronic number
4560 triangular number
4567 consecutive digits
4579 octahedral number
4597 balanced prime
4607 Woodall number
4619 highly cototient number
4624
4641 magic constant of n×n normal magic square and n-queens problem for n = 21.
4656 triangular number
4657 balanced prime
4661 sum of the first 48 primes
4663 centered heptagonal number
4665 33333 in base-6
4679 safe prime
4681 eighth super-Poulet number
4691 balanced prime
4692 pronic number
4699 nonagonal number
4703 safe prime
4705 , centered square number
4727 sum of the squares of the first twelve primes
4733 Sophie Germain prime
4753 triangular number
4760 2222 in base-13
4761 , centered octagonal number
4787 safe prime
4788 14th Keith number
4793 Sophie Germain prime
4795 decagonal number
4799 safe prime
4801 cuban prime of the form x = y + 2, smallest prime with a composite sum of digits in base 7
4802 20000 in base-7
4830 pronic number
4851 triangular number, pentagonal pyramidal number
4862 Catalan number
4871 Sophie Germain prime
4879 11th Kaprekar number
4888 sum of the first 49 primes
4900 , the only square-pyramidal square other than 1[1]
4901 centered square number
4913 17th cube
4919 Sophie Germain prime, safe prime
4920 6666 in base-9
4922 centered heptagonal number
4941 centered cube number
4943 Sophie Germain prime
4950 triangular number, 12th Kaprekar number
4959 nonagonal number
4960 tetrahedral number; greater of fourth pair of Smith brothers
4970 pronic number
4991 Lucas–Carmichael number
4993 balanced prime
5000 round number
5003 Sophie Germain prime
5020 amicable number with 5564
5039 factorial prime, Sophie Germain prime
5040 7!, superior highly composite number
5041 , centered octagonal number
5050 triangular number, Kaprekar number, sum of first 100 integers
5051 Sophie Germain prime
5076 decagonal number
5081 Sophie Germain prime
5087 safe prime
5099 safe prime
5103 7000 in base-9
5107 balanced prime
5113 balanced prime
5151 triangular number
5167 cuban prime of the form x = y + 1
5171 Sophie Germain prime
5184
5186 φ(5186) = 2592
5187 φ(5187) = 2592
5188 φ(5189) = 2592, centered heptagonal number
5226 nonagonal number
5231 Sophie Germain prime
5244
5249 highly cototient number
5253 triangular number
5279 Sophie Germain prime
5280 is the number of feet in a mile. It is evenly divisible by three, yielding exactly 1760 yards per mile and by 16.5, yielding exactly 320 rods per mile.
5292 Kaprekar number
5303 Sophie Germain prime, balanced prime
5324 4000 in base-11
5329 , centered octagonal number
5333 Sophie Germain prime
5335 magic constant of n×n normal magic square and n-queens problem for n = 22.
5340 octahedral number
5356 triangular number
5365 decagonal number
5387 safe prime, balanced prime
5392 Leyland number
5393 balanced prime
5399 Sophie Germain prime, safe prime
5405 member of a Ruth–Aaron pair with 5406 (either definition)
5406 member of a Ruth–Aaron pair with 5405 (either definition)
5419 Cuban prime of the form x = y + 1
5432 consecutive digits
5441 Sophie Germain prime
5456 tetrahedral number
5459 highly cototient number
5460 triangular number
5461 super-Poulet number, centered heptagonal number, binary 1010101010101
5476
5483 safe prime
5488 2000 in base-14
5500 nonagonal number
5501 Sophie Germain prime
5507 safe prime
5525 square pyramidal number
5536 tetranacci number
5555 repdigit
5563 balanced prime
5564 amicable number with 5020
5565 triangular number
5566 pentagonal pyramidal number
5571 perfect totient number
5602 22222 in base-7
5625 , centered octagonal number
5639 Sophie Germain prime, safe prime
5655 3333 in base-12
5662 decagonal number
5671 triangular number
5678 consecutive digits
5711 Sophie Germain prime
5719 Zeisel number, Lucas–Carmichael number
5740 7777 in base-9
5741 Sophie Germain prime, Pell number, Markov number, centered heptagonal number
5768 tribonacci number
5776
5777 smallest counterexample to the conjecture that all odd numbers are of the form
5778 triangular number
5781 nonagonal number
5798 Motzkin number
5807 safe prime, balanced prime
5832 183
5849 Sophie Germain prime
5856 4444 in base-11
5879 safe prime, highly cototient number
5886 triangular number
5903 Sophie Germain prime
5910 2222 in base-14
5913 sum of the first seven factorials
5927 safe prime
5929 , centered octagonal number
5939 safe prime
5967 decagonal number
5984 tetrahedral number
5995 triangular number
6000 (six thousand) is the natural number following 5999 and preceding 6001
6028 centered heptagonal number
6047 safe prime
6053 Sophie Germain prime
6069 nonagonal number
6073 balanced prime
6084 , sum of the cubes of the first twelve integers
6089 highly cototient number
6095 magic constant of n×n normal magic square and n-Queens Problem for n = 23.
6101 Sophie Germain prime
6105 triangular number
6113 Sophie Germain prime
6131 Sophie Germain prime
6143 Thabit number
6173 Sophie Germain prime
6174 Kaprekar's constant
6181 octahedral number
6200 harmonic divisor number
6201 square pyramidal number
6211 cuban prime of the form x = y + 1
6216 triangular number
6220 44444 in base-6
6232 amicable number with 6368
6241 , centered octagonal number
6250 Leyland number
6263 Sophie Germain prime, balanced prime
6269 Sophie Germain prime
6280 decagonal number
6317 balanced prime
6322 centered heptagonal number
6323 Sophie Germain prime, balanced prime
6328 triangular number
6329 Sophie Germain prime
6348 pentagonal pyramidal number
6364 nonagonal number
6367 balanced prime
6368 amicable number with 6232
6373 balanced prime
6399 smallest integer that cannot be expressed as a sum of fewer than 279 eighth powers
6400
6408 sum of the squares of the first thirteen primes
6441 triangular number
6449 Sophie Germain prime
6466 Markov number
6480 50000 in base-6
6491 Sophie Germain prime
6509 highly cototient number
6521 Sophie Germain prime
6543 consecutive digits
6545 tetrahedral number
6551 Sophie Germain prime
6555 triangular number
6556 member of a Ruth-Aaron pair with 6557 (first definition)
6557 member of a Ruth-Aaron pair with 6556 (first definition)
6560 22222222 in base-3
6561 , , perfect totient number, centered octagonal number
6563 Sophie Germain prime
6581 Sophie Germain prime
6591 3000 in base-13
6599 safe prime
6601 Carmichael number, decagonal number
6623 centered heptagonal number
6655 5000 in base-11
6659 safe prime
6666 nonagonal number
6670 triangular number
6719 safe prime, highly cototient number
6724
6728 number of domino tilings of a 6×6 checkerboard
6750 2000 in base-15
6761 Sophie Germain prime
6765 20th Fibonacci number
6779 safe prime
6786 triangular number
6789 consecutive digits
6811 member of a Ruth-Aaron pair with 6812 (first definition)
6812 member of a Ruth-Aaron pair with 6811 (first definition)
6827 safe prime
6863 balanced prime
6880 vampire number
6889 , centered octagonal number
6899 Sophie Germain prime, safe prime
6903 triangular number
6912 4000 in base-12
6924 magic constant of n×n normal magic square and n-Queens Problem for n = 24.
6929 highly cototient number
6930 decagonal number, square pyramidal number
6931 centered heptagonal number
6975 nonagonal number
6977 balanced prime
6983 Sophie Germain prime, safe prime
7000 (seven thousand) is the natural number following 6999 and preceding 7001
7021 triangular number
7043 Sophie Germain prime
7056
7057 cuban prime of the form x = y + 1
7073 Leyland number
7079 Sophie Germain prime, safe prime
7103 Sophie Germain prime
7106 octahedral number
7121 Sophie Germain prime
7140 triangular number, also a pronic number and hence 7140/2=3570 is also a triangular number, tetrahedral number
7151 Sophie Germain prime
7187 safe prime
7192 weird number
7193 Sophie Germain prime
7200 pentagonal pyramidal number
7203 30000 in base-7
7211 Sophie Germain prime
7225 , centered octagonal number
7230
7232 2222 in base-15
7246 centered heptagonal number
7247 safe prime
7260 triangular number
7267 decagonal number
7272 Kaprekar number
7291 nonagonal number
7320 5555 in base-11
7349 Sophie Germain prime
7351 cuban prime of the form x = y + 1
7381 triangular number
7385 Keith number
7396
7433 Sophie Germain prime
7471 centered cube number
7503 triangular number
7523 balanced prime, safe prime
7540 4444 in base-12
7541 Sophie Germain prime
7559 safe prime
7560 highly composite number
7561 Markov number
7568 centered heptagonal number
7569 , centered octagonal number
7583 balanced prime
7607 safe prime
7612 decagonal number
7614 nonagonal number
7626 triangular number
7643 Sophie Germain prime, safe prime
7647 Keith number
7649 Sophie Germain prime
7654 consecutive digits
7691 Sophie Germain prime
7699 emirp, sum of first 60 primes
7703 safe prime
7714 square pyramidal number
7727 safe prime
7744 , square nialpdrome not ending in 0
7750 triangular number
7770 tetrahedral number
7775 55555 in base-6
7776
7777 Kaprekar number
7810 ISO/IEC 7810 is the ISO's standard for physical characteristics of identification cards
7812 222222 in base-5
7823 Sophie Germain prime, safe prime, balanced prime
7825 magic constant of n×n normal magic square and n-Queens Problem for n = 25.
7841 Sophie Germain prime, balanced prime
7875 triangular number
7883 Sophie Germain prime
7897 centered heptagonal number
7901 Sophie Germain prime
7909 Keith number
7912 weird number
7920 the order of the Mathieu group M11, the smallest sporadic simple group
7921 , centered octagonal number
7944 nonagonal number
7957 super-Poulet number
7965 decagonal number
7979 highly cototient number
7986 6000 in base-11
8000 (eight thousand) is the natural number following 7999 and preceding 8001
8001 triangular number
8002 Mertens function zero
8011 Mertens function zero
8012 Mertens function zero
8017 Mertens function zero
8021 Mertens function zero
8039 safe prime
8069 Sophie Germain prime
8093 Sophie Germain prime
8100
8111 Sophie Germain prime
8117 balanced prime
8119 octahedral number
8125 pentagonal pyramidal number
8128 perfect number, harmonic divisor number, 127th triangular number, 64th hexagonal number, eighth 292-gonal number, fourth 1356-gonal number
8147 safe prime
8189 highly cototient number
8190 harmonic divisor number
8191 Mersenne prime
8192 power of two
8208 base 10 narcissistic number as
8232 3000 in base-14
8233 centered heptagonal number
8243 Sophie Germain prime
8256 triangular number
8257 sum of the squares of the first fourteen primes
8269 cuban prime of the form x = y + 1
8273 Sophie Germain prime
8281 , sum of the cubes of the first thirteen integers, nonagonal number, centered octagonal number
8321 super-Poulet number
8326 decagonal number
8361 Leyland number
8385 triangular number
8403 33333 in base-7
8423 safe prime
8436 tetrahedral number
8464
8513 Sophie Germain prime
8515 triangular number
8543 safe prime
8555 square pyramidal number
8576 centered heptagonal number
8625 enneagonal number
8640 5000 in base-12
8646 triangular number
8649 , centered octagonal number
8663 Sophie Germain prime
8693 Sophie Germain prime
8695 decagonal number
8699 safe prime
8712 smallest number that is divisible by its reverse: 8712 = 4×2178 (excluding palindromes and numbers with trailing zeros)
8713 balanced prime
8738 2222 in base-16
8741 Sophie Germain prime
8747 safe prime, balanced prime
8751 perfect totient number
8765 consecutive digits
8778 triangular number
8783 safe prime
8784 6666 in base-11
8788 4000 in base-13
8801 magic constant of n×n normal magic square and n-Queens Problem for n = 26.
8819 safe prime
8833
8836
8855 member of a Ruth-Aaron pair (first definition) with 8856
8856 member of a Ruth-Aaron pair (first definition) with 8855
8865 3333 in base-14
8888 repdigit
8911 Carmichael number, triangular number
8926 centered heptagonal number
8944 sum of the cubes of the first seven primes
8951 Sophie Germain prime
8963 safe prime
8969 Sophie Germain prime
8976 enneagonal number
9000 (nine thousand) is the natural number following 8999 and preceding 9001
9009 centered cube number
9025 952, centered octagonal number
9029 Sophie Germain prime
9045 triangular number
9059 Sophie Germain prime
9072 decagonal number
9077 Markov number
9091 unique prime
9126 pentagonal pyramidal number
9139 tetrahedral number
9180 triangular number
9216 962
9221 Sophie Germain prime
9224 octahedral number
9241 cuban prime of the form x = y + 1
9261 213, largest 4 digit perfect cube
9272 weird number
9283 centered heptagonal number
9293 Sophie Germain prime
9316 triangular number
9317 7000 in base-11
9331 111111 in base-6
9334 nonagonal number
9349 Lucas prime
9362 22222 in base-8
9371 Sophie Germain prime
9375 300000 in base-5
9397 balanced prime
9409 972, centered octagonal number
9419 Sophie Germain prime
9425 5555 in base-12
9453 triangular number
9455 square pyramidal number
9457 decagonal number
9467 safe prime
9473 Sophie Germain prime, balanced prime
9479 Sophie Germain prime
9520 4444 in base-13
9539 Sophie Germain prime
9587 safe prime
9591 triangular number
9604 982
9629 Sophie Germain prime
9647 centered heptagonal number
9660 ISO 9660 standard for CD-ROM file system
9689 Sophie Germain prime
9699 nonagonal number
9730 triangular number
9743 safe prime
9791 Sophie Germain prime
9800 member of a Ruth-Aaron pair (first definition) with 9801
9801 992, centered octagonal number, member of a Ruth-Aaron pair (first definition) with 9800
9839 safe prime
9841 111111111 in base-3
9850 decagonal number
9855 magic constant of n × n normal magic square and n-Queens Problem for n = 27.
9870 triangular number
9871 balanced prime
9876 consecutive digits
9880 tetrahedral number
9887 safe prime
9899 ISO 9899 standard for C programming language
9901 unique prime
9923 probably smallest certainly executable prime number on x86 MS-DOS
9999 repdigit
10000 round number
10033 a character from the fictional Vlog series lonelygirl15
10080 highly composite number; number of minutes in a week
10125 3000 in base-15
10201 palindromic square (in the decimal system)
10206 pentagonal pyramidal number
10223 smallest of six remaining Seventeen or Bust numbers in the Sierpinski problem
10239 Woodall number
10248 7777 in base-11
10267 cuban prime
10301 palindromic prime (in the decimal system)
10333 star prime
10368 6000 in base-12
10416 square pyramidal number
10425 octahedral number
10430 weird number
10440 144th triangular number
10501 palindromic prime
10538 a hit single by Electric Light Orchestra
10570 weird number
10585 Carmichael number
10601 palindromic prime
10609 tribonacci number
10646 ISO 10646 is the standard for Unicode
10648 8000 in base-11
10660 tetrahedral number
10671 tetranacci number
10744 amicable number with 10856
10752 the second 16-bit word of a TIFF file if the byte order marker is misunderstood
10792 weird number
10800 number of bricks used for the uttaravedi in the Agnicayana ritual
10837 star prime
10848 3333 in base-15
10856 amicable number with 10744
10905 Wedderburn–Etherington number
10922 binary 10101010101010
10946 Fibonacci number, Markov number
10976 4000 in base-14
10985 5000 in base-13
10989 reverses when multiplied by 9
10990 weird number
11025 sum of the cubes of the first 14 positive integers
11111 repdigit
11204 44444 in base-7
11310 6666 in base-12
11311 palindromic prime
11353 star prime
11368 pentagonal pyramidal number
11410 weird number
11411 palindromic prime
11440 square pyramidal number
11480 tetrahedral number
11605 smallest integer to start a run of five consecutive integers with the same number of divisors
11690 weird number
11712 8888 in base-11
11718 333333 in base-5
11719 cuban prime
11726 octahedral number
11820 4444 in base-14
11826 smallest number whose square (algebra) is pandigital but lacks zeros.
11900 5555 in base-13
11979 9000 in base-11
12005 50000 in base-7
12096 7000 in base-12
12097 cuban prime
12110 weird number
12198 semi-meandric number
12285 amicable number with 14595
12287 Thabit number
12288 3000000 in base-4
12321 palindromic square
12341 tetrahedral number
12345 consecutive digits
12421 palindromic prime
12500 400000 in base-5
12529 square pyramidal number
12530 weird number
12670 weird number
12721 palindromic prime
12726 Ruth–Aaron pair
12758 largest number that cannot be expressed as the sum of distinct cubes
12765 Finnish internet meme; the code accompanying no-prize caps in a Coca-Cola bottle top prize contest. Often spelled out yksi – kaksi – seitsemän – kuusi – viisi, ei voittoa, "one – two – seven – six – five, no prize").
12821 palindromic prime
13107 3333 in base-16
13122 200000000 in base-3
13131 octahedral number
13176 9999 in base-11
13182 6000 in base-13
13195 7777 in base-12
13244 tetrahedral number
13267 cuban prime
13331 palindromic prime
13370 weird number
13500 4000 in base-15
13510 weird number
13669 cuban prime
13685 square pyramidal number
13720 5000 in base-14
13790 weird number
13820 meandric number, open meandric number
13824 8000 in base-12
13831 palindromic prime
13860 Pell number
13930 weird number
13931 palindromic prime
13950 pentagonal pyramidal number
14005 55555 in base-7
14043 33333 in base-8
14190 tetrahedral number
14200 number of n-Queens Problem solutions for n = 12,
14280 6666 in base-13
14341 palindromic prime
14400 sum of the cubes of the first 15 positive integers
14406 60000 in base-7
14464 4444 in base-15
14595 amicable number with 12285
14641 palindromic square
14644 octahedral number
14701 Markov number
14741 palindromic prime
14762 22222 in base-9
14770 weird number
14775 5555 in base-14
14910 square pyramidal number
15015 smallest odd and square-free abundant number
15080 8888 in base-12
15120 highly composite number
15180 tetrahedral number
15376 pentagonal pyramidal number
15379 7000 in base-13
15387 Zeisel number
15451 palindromic prime
15511 Motzkin number
15551 palindromic prime
15552 200000 in base-6
15610 weird number
15624 444444 in base-5
15625
15841 Carmichael number
15890 weird number
16030 weird number
16061 palindromic prime
16091 strobogrammatic prime
16105 11111 in base-11
16127 Carol prime, also an emirp
16206 square pyramidal number
16269 octahedral number
16310 weird number
16361 palindromic prime
16383 3333333 in base-4
16384
16447 Friedman number
16464 6000 in base-14
16561 palindromic prime
16580 Leyland number
16639 Kynea number
16651 cuban prime
16660 7777 in base-13
16661 palindromic prime
16730 weird number
16796 Catalan number
16806 66666 in base-7
16807
16843 Wolstenholme prime
16870 weird number
16875 5000 in base-15
16896 pentagonal pyramidal number
16965 9999 in base-12
17163 the largest number that is not the sum of the squares of distinct primes
17272 weird number
17296 amicable number with 18416
17344 Kaprekar number
17471 palindromic prime
17476 4444 in base-16
17570 weird number
17575 square pyramidal number
17576 263
17711 Fibonacci number
17730 6666 in base-14
17971 palindromic prime
17990 weird number
18010 octahedral number
18080 5555 in base-15
18181 palindromic prime, strobogrammatic prime
18410 weird number
18416 amicable number with 17296
18481 palindromic prime
18496 sum of the cubes of the first 16 positive integers
18600 harmonic divisor number
18620 harmonic divisor number
18662 222222 in base-6
18724 44444 in base-8
18785 Leyland number
18830 weird number
18970 weird number
19019 square pyramidal number
19040 8888 in base-13
19208 7000 in base-14
19390 weird number
19391 palindromic prime
19441 cuban prime
19455 smallest integer that cannot be expressed as a sum of fewer than 548 ninth powers
19513 tribonacci number
19531 repunit prime in base 5
19600 , tetrahedral number
19608 111111 in base-7
19609 first prime followed by a prime gap of over fifty
19670 weird number
19682 222222222 in base-3
19683
19773 9000 in base-13
19871 octahedral number
19891 palindromic prime
19927 cuban prime
19991 palindromic prime
20000 round number; also in the title of Jules Verne's novel 20,000 Leagues Under The Sea
20081 Motorola 68K instruction for no operation (NOP)
20100 sum of the first 200 natural numbers (hence a triangular number)
20160 highly composite number; the smallest order belonging to two non-isomorphic simple groups: the alternating group A8 and the Chevalley group A2(4)
20161 the largest integer that cannot be expressed as a sum of two abundant numbers
20230 pentagonal pyramidal number
20250 6000 in base-15
20412 Leyland number
20480 50000 in base-8
20540 square pyramidal number
20569 tetranacci number
20685 7777 in base-14
20736 12^4, 1000012
20903 first prime of form 120k+23 that is not a full reptend prime
21147 Bell number
21181 one of six remaining Seventeen or Bust numbers in the Sierpinski problem
21420 9999 in base-13
21696 6666 in base-15
21845 binary 101010101010101
21856 octahedral number
21952 8000 in base-14
21978 reverses when multiplied by 4
22050 pentagonal pyramidal number
22140 square pyramidal number
22143 33333 in base-9
22222 Kaprekar number
22447 cuban prime
22527 Woodall number
22621 11111 in base-12
22699 one of six remaining Seventeen or Bust numbers in the Sierpinski problem
23328 300000 in base-6
23401 Leyland number
23405 55555 in base-8
23409 sum of the cubes of the first 17 positive integers
23456 consecutive digits
23497 cuban prime
23625 7000 in base-15
23640 8888 in base-14
23821 square pyramidal number
23969 octahedral number
23976 pentagonal pyramidal number
24211 Zeisel number
24571 cuban prime
24576 60000 in base-8
24601 Jean Valjean's prisoner number in Les Miserables
24631 Wedderburn-Etherington number
24696 9000 in base-14
24737 one of six remaining Seventeen or Bust numbers in the Sierpinski problem
25011 the first composite number that in base 10 remains composite after any insertion of a digit
25085 Zeisel number
25117 cuban prime
25200 highly composite number
25205 largest number whose factorial is less than 10100000
25312 7777 in base-15
25585 square pyramidal number
26214 octahedral number
26227 cuban prime
26244 40000 in base-9
26595 9999 in base-14
26861 smallest number below which there are more primes of the form 4k + 1 than of the form 4k + 3
27000 8000 in base-15
27434 square pyramidal number
27559 Zeisel number
27648 11*22*33*44
27720 highly composite number; smallest number divisible by the numbers 1 to 12 (there is no smaller number divisible by the numbers 1 to 11)
27846 harmonic divisor number
27993 333333 in base-6
28086 66666 in base-8
28158 pentagonal pyramidal number
28374 smallest integer to start a run of six consecutive integers with the same number of divisors
28561 , number that is simultaneously a square number and a centered square number
28595 octahedral number
28657 Fibonacci number, Markov number
28672 70000 in base-8
28928 8888 in base-15
29241 sum of the cubes of the first 18 positive integers
29282 20000 in base-11
29341 Carmichael number
29370 square pyramidal number
29524 1111111111 in base-3
30000 round number
30029 primorial prime
30030 primorial
30240 harmonic divisor number
30375 9000 in base-15
30420 pentagonal pyramidal number
30583 7777 in base-16
30694 open meandric number
30941 first base 13 repunit prime
31104 400000 in base-6
31116 octahedral number
31250 2000000 in base-5
31337 cousin prime, pronounced elite, an alternate way to spell 1337, an obfuscated alphabet made with numbers and punctuation, known and used in the gamer, hacker and BBS cultures.
31395 square pyramidal number
31397 prime number followed by a record prime gap of 72, the first above 52
31721 start of a prime quadruplet
31929 Zeisel number
32043 smallest number whose square is pandigital.
32045 can be expressed as a sum of two squares in more ways than any smaller number
32210 22222 in base-11
32544 9999 in base-15
32760 harmonic divisor number
32761 , centered hexagonal number
32767 , largest positive value for a signed (two's complement) 16-bit integer on a computer.
32768 , maximum absolute value of a negative value for a signed (two's complement) 16-bit integer on a computer.
32800 pentagonal pyramidal number
32805 50000 in base-9
32993 Leyland number
33333 repdigit
33461 Pell number, Markov number
33511 square pyramidal number
33614 200000 in base-7
33781 octahedral number
34560 5 superfactorial
34567 consecutive digits
34841 start of a prime quadruplet
34952 8888 in base-16
34969 favorite number of the Muppet character Count von Count
35720 square pyramidal number
35840 number of ounces in a long ton (2,240 pounds)
35890 tribonacci number
35899 alternating factorial
35937 chiliagonal number
35964 digit-reassembly number
36100 sum of the cubes of the first 19 positive integers
36594 octahedral number
36864 9000 in base-16
36905 55555 in base-9
37324 444444 in base-6
37378 semi-meandric number
37449 111111 in base-8
37666 Markov number
37926 pentagonal pyramidal number
38024 square pyramidal number
38416 10000 in base-14
38880 500000 in base-6
38962 Kaprekar number
39062 2222222 in base-5
39216 222222 in base-7
39321 9999 in base-16
39366 2000000000 in base-3
39559 octahedral number
39648 tetranacci number
40000 round number, 200 squared
40320 smallest factorial that is not a highly composite number
40425 square pyramidal number
40585 largest factorion
40678 pentagonal pyramidal number
40804 palindromic square
41041 Ryle number
41371 11111 in base-14
41472 20000 in base-12
41616 triangular square number
41835 Motzkin number
42680 octahedral number
42925 square pyramidal number
43261 Markov number
43560 pentagonal pyramidal number
43690 binary 1010101010101010
43691 Wagstaff prime
43923 30000 in base-11
44100 sum of the cubes of the first 20 positive integers, sampling rate of Red Book-compliant audio compact disks
44286 66666 in base-9
44444 repdigit
44721 When n > 44721, the expression 1/n - 1/(n+2) drops down to fractions of a billionth. The corresponding sum in the Leibniz formula for pi is 0.785386986.
44944 palindromic square
45242 22222 in base-12
45360 highly composite number; first number to have 100 factors (including one and itself)
45678 consecutive digits
45927 70000 in base-9
46233 sum of the first eight factorials
46368 Fibonacci number
46655 555555 in base-6
46656
46657 Carmichael number
46664 Nelson Mandela's prisoner number
46853 Number of customers in the SpongeBob SquarePants episode Patty Hype
46875 3000000 in base-5
47058 primary pseudoperfect number
47806 in hexadecimal it is written as "BABE"
48315 33333 in base-11
49151 Woodall number
49152 30000000 in base-4
49726 pentagonal pyramidal number
50000 round number
50400 highly composite number
50421 300000 in base-7
50625 smallest fourth power that can be expressed as the sum of only five distinct fourth powers
51641 Markov number
51667 77777 in base-9
51984 . the smallest square to the sum of only five distinct fourth powers.
52375 Address of the office building in the Counter-Strike map Cs_Office
52488 80000 in base-9
52633 Carmichael number
53016 pentagonal pyramidal number
53361 sum of the cubes of the first 21 positive integers
54205 Zeisel number
54241 11111 in base-15
54321 consecutive digits
54748 narcissistic number
54901 chiliagonal number
55440 superior highly composite number; colossally abundant number
55459 one of six remaining Seventeen or Bust numbers in the Sierpinski problem
55555 repdigit
55860 harmonic divisor number
55987 1111111 in base-6
56011 Wedderburn-Etherington number
56448 pentagonal pyramidal number
56789 consecutive digits
57122 20000 in base-13
58367 smallest integer that cannot be expressed as a sum of fewer than 1079 tenth powers
58564 40000 in base-11
58593 3333333 in base-5
58786 Catalan number
58824 333333 in base-7
59048 2222222222 in base-3
59049
59081 Zeisel number
60000 round number
60049 Leyland number
61882 22222 in base-13
62208 30000 in base-12
62210 Markov number
62500 4000000 in base-5
62745 Carmichael number
63020 amicable number with 76084
63360 inches in a mile
63750 pentagonal pyramidal number
63973 Carmichael number
64009 sum of the cubes of the first 22 positive integers
64420 44444 in base-11
65023 Carol number
65279 Unicode code point for byte order mark
65432 consecutive digits
65534 Unicode code point guaranteed not to be a character
65535 largest value for an unsigned 16-bit integer on a computer.
65536 , also 2↑↑4 using Knuth's up-arrow notation, smallest integer with exactly 17 divisors.
65537 Fermat prime
65539 the 6544th prime number, and both 6544 and 65539 have digital root of 1; a regular prime; a larger member of a twin prime pair; a smaller member of a cousin prime pair; a happy prime; a weak prime; a middle member of a prime triplet, (65537, 65539, 65543); a middle member of a three-term primes in arithmetic progression, (65521, 65539, 65557).
65792 Leyland number
66012 tribonacci number
66047 Kynea number
66198 Giuga number
66430 111111 in base-9
66666 repdigit
67228 400000 in base-7
67607 largest of six remaining Seventeen or Bust numbers in the Sierpinski problem
67626 pentagonal pyramidal number
67863 33333 in base-12
69632 Leyland number
69696 square of 264; only known palindromic square that can be expressed as the sum of a pair of twin primes: 69696 = 34847 + 34849.
69905 11111 in base-16
70000 round number
71656 pentagonal pyramidal number
73205 50000 in base-11
73712 number of n-Queens Problem solutions for n = 13,
74205 registry number of the USS Defiant on Star Trek: Deep Space Nine
74656 registry number of the USS Voyager on Star Trek: Voyager
74898 222222 in base-8
75025 Fibonacci number, Markov number
75361 Carmichael number
76084 amicable number with 63020
76176 sum of the cubes of the first 23 positive integers 2762
76424 tetranacci number
76543 consecutive digits
76832 20000 in base-14
77777 repdigit
77778 Kaprekar number
78124 4444444 in base-5
78125
78432 444444 in base-7
78557 conjectured to be the smallest Sierpinski number
80000 round number
80286 model number of the Intel 80286 chip
80386 model number of the Intel 80386 chip
80486 model number of the Intel 80486 chip
80525 55555 in base-11
80782 Pell number
81000 round number
82000 is the only number greater than 2 that can be written from base 2 to base 5 using only 0's and 1's.
82656 Kaprekar number
82742 22222 in base-14
82944 40000 in base-12
83160 highly composite number
83521 17^4
84035 500000 in base-7
85683 30000 in base-13
86400 seconds in a day; 28801-gonal number; highly powerful number; solution to Singmaster's problem when n = 11
87360 unitary perfect number
87381 binary 10101010101010101
87654 consecutive digits
87846 60000 in base-11
88573 11111111111 in base-3
88888 repdigit
90000 sum of the cubes of the first 24 positive integers, square of 300.
90484 44444 in base-12
90625 the only five-digit automorphic number
92823 33333 in base-13
93312 Leyland number
94932 Leyland number
95121 Kaprekar number
96557 Markov number
96630 66666 in base-11
97656 11111111 in base-5
98040 555555 in base-7
98304 300000 in base-8
98765 consecutive digits
99066 largest number whose square (algebra) uses all of the decimal digits once.
99999 Kaprekar number, repdigit
100000 round number
100003 smallest 6-digit prime number
100255 Friedman number[1]
100842 600000 in base-7
101101 smallest palindromic Carmichael number
101250 20000 in base-15
101723 smallest prime number whose square is a pandigital number containing each digit from 0 to 9
102487 70000 in base-11
102564 The smallest parasitic number
103680 highly totient number
103769 the number of combinatorial types of 5-dimensional parallelohedra
103823 nice Friedman number
104723 the 9,999th prime number
104729 the 10,000th prime number
104869 the smallest prime number containing every non-prime digit.
105664 harmonic divisor number
108482 22222 in base-15
110880 highly composite number
111111 repunit
111777 smallest natural number requiring 17 syllables in American English, 19 in British English
111974 2222222 in base-6
112347 333333 in base-8
112735 77777 in base-11
113105 55555 in base-12
113634 Motzkin number for n = 14
114244 40000 in base-13
114689 prime factor of F12
115248 30000 in base-14
115975 Bell number
117067 first prime vampire number
117128 80000 in base-11
117648 666666 in base-7
117649 76
117800 harmonic divisor number
118098 20000000000 in base-3
120284 Keith number
120960 highly totient number
121393 Fibonacci number
123456 consecutive digits
123764 44444 in base-13
124000 number with religious significance
124113 33333 in base-14
124416 60000 in base-12
127777 smallest natural number requiring 18 syllables in American English, 20 in British English
127912 Wedderburn-Etherington number
128840 88888 in base-11
128981 Starts the first prime gap sequence of 2, 4, 6, 8, 10, 12, 14
129106 Keith number
131071 Mersenne prime
131072 217
131361 Leyland number
131769 90000 in base-11
132860 222222 in base-9
134340 Pluto's minor planet designation
135137 Markov number
135726 66666 in base-12
137257 1111111 in base-7
139810 22222 in base-16
139968 3000000 in base-6
142805 50000 in base-13
142857 Kaprekar number, Harshad number smallest cyclic number in decimal.
144000 number with religious significance
144945 99999 in base-11
145152 70000 in base-12
147640 Keith number
148149 Kaprekar number
149796 444444 in base-8
151875 30000 in base-15
153664 40000 in base-14
154705 55555 in base-13
156146 Keith number
156250 20000000 in base-5
158347 77777 in base-12
161051 115
161280 highly totient number
162723 33333 in base-15
163840 500000 in base-8
165484 44444 in base-14
165888 80000 in base-12
166320 highly composite number
167400 harmonic divisor number
167961 3333333 in base-6
171366 60000 in base-13
173600 harmonic divisor number
174680 Keith number
174762 binary 101010101010101010
174763 Wagstaff prime
177146 22222222222 in base-3
177147 311
177156 111111 in base-11
177777 smallest natural number requiring 19 syllables in American English, 21 in British English
178478 Leyland number
180968 88888 in base-12
181440 highly totient number
181819 Kaprekar number
183186 Keith number
185646 66666 in base-13
186624 4000000 in base-6
187110 Kaprekar number
187245 555555 in base-8
192080 50000 in base-14
195025 Pell number, Markov number
195312 22222222 in base-5
196418 Fibonacci number, Markov number
196608 300000000 in base-4
196883 the dimension of the smallest nontrivial irreducible representation of the Monster group
196884 the coefficient of q in the Fourier series expansion of the j-invariant. The adjacency of 196883 and 196884 was important in suggesting monstrous moonshine.
199290 333333 in base-9
199927 70000 in base-13
200000 round number
202500 40000 in base-15
203589 99999 in base-12
206855 55555 in base-14
207360 highly totient number
208012 Catalan number
208335 the largest number to be both triangular and square pyramidal
208495 Kaprekar number
209715 33333 in base-16
216587 77777 in base-13
216964 44444 in base-15
221760 highly composite number
222222 repdigit
223948 4444444 in base-6
224694 666666 in base-8
228488 80000 in base-13
229376 700000 in base-8
230496 60000 in base-14
233280 5000000 in base-6
234375 30000000 in base-5
234567 consecutive digits
235298 2000000 in base-7
236196 400000 in base-9
237510 harmonic divisor number
241920 highly totient number
242060 harmonic divisor number
247528 88888 in base-13
248226 66666 in base-14
248832 the smallest fifth power that can be represented as the sum of only 6 fifth powers.
253125 50000 in base-15
257049 90000 in base-13
261119 Carol number
262143 333333333 in base-4
262144 218; exponential factorial of 4; a superperfect number
262468 Leyland number
263167 Kynea number
265720 444444 in base-9
268705 Leyland number
268912 70000 in base-14
271205 55555 in base-15
271453 111111 in base-12
274177 prime factor of F6
274514 2222222 in base-7
277200 highly composite number
278469 99999 in base-13
279620 44444 in base-16
279935 5555555 in base-6
279936 67
280859 a six-digit prime number whose square (algebra) is tridigital.
289597 77777 in base-14
292968 33333333 in base-5
293547 Wedderburn-Etherington number
294685 Markov number
295245 500000 in base-9
298320 Keith number
299593 1111111 in base-8
300000 round number
303750 60000 in base-15
307328 80000 in base-14
310572 Motzkin number
312500 40000000 in base-5
317811 Fibonacci number
318682 Kaprekar number
322102 200000 in base-11
325446 66666 in base-15
326981 alternating factorial
327680 50000 in base-16
329967 Kaprekar number
330968 88888 in base-14
332150 555555 in base-9
332640 highly composite number; harmonic divisor number
333333 repdigit
333667 sexy prime and unique prime
333673 sexy prime
333679 sexy prime
335923 11111111 in base-6
345678 consecutive digits
345744 90000 in base-14
349525 binary 1010101010101010101
351352 Kaprekar number
352947 3000000 in base-7
354294 200000000000 in base-3
354312 222222 in base-11
354375 70000 in base-15
355419 Keith number
356643 Kaprekar number
360360 harmonic divisor number; the smallest number divisible by all of the numbers 1 through 15 (there is no smaller number divisble by 13)
362880 9!, highly totient number
370261 first prime followed by a prime gap of over 100
371293 135
372339 99999 in base-14
379687 77777 in base-15
389305 self-descriptive number in base 7
390313 Kaprekar number
390624 44444444 in base-5
390625 58
393216 60000 in base-16
397585 Leyland number
398580 666666 in base-9
400000 round number
402234 111111 in base-13
405000 80000 in base-15
409113 sum of the first nine factorials
411771 3333333 in base-7
413343 700000 in base-9
419430 66666 in base-16
422481 smallest number whose fourth power is the sum of three smaller fourth powers
423393 Leyland number
426389 Markov number
433928 88888 in base-15
444444 repdigit
455625 90000 in base-15
456789 consecutive digits
458752 70000 in base-16
461539 Kaprekar number
465010 777777 in base-9
466830 Kaprekar number
470596 4000000 in base-7
470832 Pell number
472392 800000 in base-9
483153 300000 in base-11
483840 highly totient number
488169 99999 in base-15
488281 111111111 in base-5
489335 77777 in base-16
497664 200000 in base-12
498960 highly composite number
499393 Markov number
499500 Kaprekar number
500000 round number
500500 Kaprekar number, sum of first 1000 integers
509203 Riesel number
510510 the product of the first seven prime numbers, thus the seventh primorial
514229 Fibonacci prime, Markov number
524287 Mersenne prime
524288 219, power of two
524649 Leyland number
531440 888888 in base-9
531441 312
531468 333333 in base-11
533169 Leyland number
533170 Kaprekar number
537824 100000 in base-14
539400 harmonic divisor number
542906 222222 in base-12
548834 equal to the sum of the sixth powers of its digits
549028 4444444 in base-7
554400 highly composite number
555555 repdigit
559240 88888 in base-16
559872 20000000 in base-6
579195 111111 in base-14
588245 5000000 in base-7
589824 90000 in base-16
597871 1111111 in base-9
599186 2222222 in base-8
600000 round number
604800 number of seconds in a week
629145 99999 in base-16
644204 400000 in base-11
646018 Markov number
654321 consecutive digits
665280 highly composite number
666666 repdigit
671846 22222222 in base-6
676157 Wedderburn-Etherington number
678570 Bell number
686285 5555555 in base-7
694280 Keith number
695520 harmonic divisor number
699050 binary 10101010101010101010
700000 round number
705894 6000000 in base-7
708624 444444 in base-11
720720 superior highly composite number; colossally abundant number; the smallest number divisible by all the numbers 1 through 16
725760 highly totient number
726180 harmonic divisor number
742586 200000 in base-13
742900 Catalan number
746496 300000 in base-12
753480 harmonic divisor number
759375 100000 in base-15
765432 consecutive digits
765623 emirp, Friedman number 56 × 72 - 6 ÷ 3
777777 repdigit, smallest natural number requiring 20 syllables in American English, 22 in British English
781250 200000000 in base-5
786432 3000000000 in base-4
800000 round number
804468 222222 in base-13
805255 500000 in base-11
813616 111111 in base-15
814359 333333 in base-12
823542 6666666 in base-7
823543 77
832040 Fibonacci number
839808 30000000 in base-6
853467 Motzkin number
876543 consecutive digits
885780 555555 in base-11
888888 repdigit
898779 3333333 in base-8
900000 round number
925765 Markov number
925993 Keith number
950976 harmonic divisor number
960800 11111111 in base-7
966306 600000 in base-11
967680 highly totient number
976562 222222222 in base-5
987654 consecutive digits
995328 400000 in base-12
999983 largest 6-digit prime number
999999 The divisibility of this number by 7 and by 13 accounts for the fact that rational numbers with those denominators have 6-digit repetends when expressed in decimal form. Repdigit. See also Feynman point.