900 (number)

← 899 900 901 →
Cardinalnine hundred
Ordinal900th
(nine hundredth)
Factorization22 × 32 × 52
Divisors1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 25, 30, 36, 45, 50, 60, 75, 90, 100, 150, 180, 225, 300, 450, 900
Greek numeralϠ´
Roman numeralCM, cm
Binary11100001002
Ternary10201003
Senary41006
Octal16048
Duodecimal63012
Hexadecimal38416
ArmenianՋ
Hebrewתת"ק / ץ
Babylonian cuneiform𒌋𒐙
Egyptian hieroglyph𓍪

900 (nine hundred) is the natural number following 899 and preceding 901.

In mathematics

It is the square of 30 and the sum of Euler's totient function for the first 54 positive integers. In base 10, it is a Harshad number. It is also the first number to be the square of a sphenic number.

In other fields

900 is also:

Integers from 901 to 999

900s

901

901 = 17 × 53. It is a centered triangular number and a happy number.

902

902 = 2 × 11 × 41. It is a sphenic number, a nontotient, and a Harshad number.

903

903 = 3 × 7 × 43. It is a sphenic number, a little Schroeder number, a Schröder–Hipparchus number, a zero of Mertens function, and the 42nd triangular number.[3]

904

904 = 23 × 113. It is a refactorable number, a lazy caterer number, and a zero of Mertens function. There are 904 1's in all partitions of 26 into odd parts.[4]

905

905 = 5 × 181. It is the smallest composite de Polignac number[5] and the sum of seven consecutive primes (109 + 113 + 127 + 131 + 137 + 139 + 149).

"The 905" is a common nickname for the suburban portions of the Greater Toronto Area in Canada, a region whose telephones used area code 905 before overlay plans added two more area codes.

906

906 = 2 × 3 × 151. It is a strobogrammatic number, a sphenic number, and a zero of Mertens function.

907

907 is a prime number.

908

908 = 22 × 227. It is a nontotient. There are 908 primitive sorting networks on 6 elements.[6] There are 908 rhombic tilings of a 12-gon.[6]

909

909 = 32 × 101. There are 909 non-isomorphic aperiodic multiset partitions of weight 7.[7]

910s

910

910 = 2 × 5 × 7 × 13. It is a Harshad number, a happy number, a zreo of Mertens function, and a balanced number.[8] There are 910 polynomial symmetric functions of matrix of order 7 under separate row and column permutations.[9]

911

It is a prime number, a Sophie Germain prime,[10] and the sum of three consecutive primes (293 + 307 + 311). It is an Eisenstein prime with no imaginary part[11] and real part of the form . Since 913 is a semiprime, 911 is a Chen prime.[12]

It is also a centered decagonal number.[13][10]

There are 911 inverse semigroups of order 7.[14]

911 is obtained by concatenating its product of digits and sum of digits.

911 can be a short form of referring to the terrorist attack in the United States in 2001.

912

912 = 24 × 3 × 19. It is a Harshad number, the sum of four consecutive primes (223 + 227 + 229 + 233), and the sum of ten consecutive primes (71 + 73 + 79 + 83 + 89 + 97 + 101 + 103 + 107 + 109).

913

913 = 11 × 83. It is a Smith number[15] and a zero of Mertens function.

914

914 = 2 × 457. It is a nontotient. There are 914 compositions of 11 that are neither weakly increasing nor weakly decreasing.[16]

915

915 = 3 × 5 × 61. It is a sphenic number, a Smith number,[15] a Harshad number, and a zero of Mertens function.

916

916 = 22 × 229. It is a strobogrammatic number, a zero of Mertens function, a nontotient, and a member of the Mian–Chowla sequence.[17]

917

917 = 7 × 131. It is the sum of five consecutive primes (173 + 179 + 181 + 191 + 193).

918

918 = 2 × 33 × 17. It is a Harshad number.

919

919 is a prime number, a cuban prime,[18] a prime index prime, a Chen prime, a palindromic prime, acentered hexagonal number,[19] and a zero of Mertens function.

920s

920

920 = 23 × 5 × 23. It is a zero of Mertens function. There are a total of 920 nodes in all rooted trees with 8 nodes.[20]

921

921 = 3 × 307. There are 921 enriched r-trees of size 7.[21]

922

922 = 2 × 461. It is a nontotient and a Smith number.[15]

923

923 = 13 × 71. There are 923 combinations of 6 things from 1 to 6 at a time.[22]

924

924 = 22 × 3 × 7 × 11. It is the sum of a twin prime (461 + 463), central binomial coefficient .[23]

925

925 = 52 × 37. It is a pentagonal number[24] and a centered square number.[25]

925 is the millesimal fineness number for Sterling silver.

926

926 = 2 × 463. It is a nontotient and the sum of six consecutive primes (139 + 149 + 151 + 157 + 163 + 167).

927

927 = 32 × 103. It is a tribonacci number.[26]

928

928 = 25 × 29. It is a happy number, the sum of four consecutive primes (227 + 229 + 233 + 239), and the sum of eight consecutive primes (101 + 103 + 107 + 109 + 113 + 127 + 131 + 137).

929

929 is a prime number, a Proth prime,[27] a palindromic prime, an Eisenstein prime with no imaginary part, and the sum of nine consecutive primes (83 + 89 + 97 + 101 + 103 + 107 + 109 + 113 + 127).

There are 929 chapters in Tanakh, giving the name to 929: Tanakh B'yachad.[28]

The PDF417 barcode format uses a GF(929) error-correction code.[29]

930s

930

930 = 2 × 3 × 5 × 31. It is a pronic number.[30]

931

931 = 72 × 19. It is the sum of three consecutive primes (307 + 311 + 313). It is a repdigit in two different bases 11130 and 77711. There are 931 regular simple graphs spanning 7 vertices.[31]

932

932 = 22 × 233. There are 932 regular simple graphs on 7 labeled nodes.[32]

933

933 = 3 × 311.

934

934 = 2 × 467. It is a nontotient.

935

935 = 5 × 11 × 17. It is a sphenic number, a Lucas–Carmichael number,[33] and a Harshad number.

936

936 = 23 × 32 × 13. It is a pentagonal pyramidal number[34] and a Harshad number.

937

937 is a prime number, a Chen prime, a star number,[35] and a happy number.

938

938 = 2 × 7 × 67. It is a sphenic number and a nontotient. There are 938 lines through at least 2 points of an 8 × 8 grid of points.[36]

939

939 = 3 × 313. There are 939 V-toothpicks after 31 rounds of the honeycomb sequence.[37]

940s

940

940 = 22 × 5 × 47. It is the totient sum for the first 55 integers.

941

941 is a prime number, a Chen prime, and an Eisenstein prime with no imaginary part. It is the sum of three consecutive primes (311 + 313 + 317) and the sum of five consecutive primes (179 + 181 + 191 + 193 + 197).

942

942 = 2 × 3 × 157. It is a sphenic number, a convolved Fibonacci number,[38] a nontotient, and the sum of four consecutive primes (229 + 233 + 239 + 241).

943

943 = 23 × 41.

944

944 = 24 × 59. It is a nontotient and a Lehmer-Comtet number.[39]

945

945 = 33 × 5 × 7. It is a Leyland number,[40] the smallest odd abundant number,[41] the smallest odd primitive abundant number,[42] and the smallest odd primitive semiperfect number.[43] 945 is the double factorial of 9: 945 = 9!!.[44]

946

946 = 2 × 11 × 43. It is a sphenic number, a hexagonal number,[45] a happy number, and the 43rd triangular number.[3]

947

947 is a prime number, a balanced prime,[46] a Chen prime, a lazy caterer number, an Eisenstein prime with no imaginary part, and the sum of seven consecutive primes (113 + 127 + 131 + 137 + 139 + 149 + 151).

948

948 = 22 × 3 × 79. It is a nontotient. It forms a Ruth–Aaron pair with 949 under the second definition. There are 948 combinatory separations of normal multisets of weight 6.[47]

949

949 = 13 × 73. It forms a Ruth–Aaron pair with 948 under the second definition.

950s

950

950 = 2 × 52 × 19. It is a nontotient and a generalized pentagonal number.[48]

951

951 = 3 × 317. It is a centered pentagonal number.[49]

952

952 = 23 × 7 × 17. There are 952 reduced words of length 3 in the Weyl group D_17.[50] There are 952 regions in regular tetradecagon with all diagonals drawn.[51]

953

953 is a prime number, a Sophie Germain prime,[52] a Chen prime, an Eisenstein prime with no imaginary part, and a centered heptagonal number.[53]

954

954 = 2 × 32 × 53. It is a nontotient, a Harshad number, and the sum of ten consecutive primes (73 + 79 + 83 + 89 + 97 + 101 + 103 + 107 + 109 + 113). It is sixth derivative of x^(x^x) evaluated at x=1.[54]

955

955 = 5 × 191. There are 955 transitive rooted trees with 17 nodes.

956

956 = 22 × 239. There are 956 compositions of 13 into powers of 2.[55]

957

957 = 3 × 11 × 29 = antisigma(45).[56] It is a sphenic number.

958

958 = 2 × 479. It is a nontotient and a Smith number.[15]

It is the millesimal fineness number for Britannia silver

959

959 = 7 × 137. It is a composite de Polignac number.[57]

960s

960

960 = 26 × 3 × 5. It is aHarshad number and the sum of six consecutive primes (149 + 151 + 157 + 163 + 167 + 173).

There are 960 possible starting positions for the chess variant Chess960.

961

961 = 312. It is the largest 3-digit perfect square and a centered octagonal number.[58] It is the sum of three consecutive primes (313 + 317 + 331) and the sum of five consecutive primes (181 + 191 + 193 + 197 + 199).

962

962 = 2 × 13 × 37. It is a sphenic number and a nontotient.

963

963 = 32 × 107. It is the sum of the first 24 primes.

964

964 = 22 × 241. It is a happy number, a nontotient, the totient sum of the first 56 integers, and the sum of four consecutive primes (233 + 239 + 241 + 251).

965

965 = 5 × 193.

966

966 = 2 × 3 × 7 × 23 = . It is a Harshad number and the sum of eight consecutive primes (103 + 107 + 109 + 113 + 127 + 131 + 137 + 139).

967

967 is a prime number and a prime index prime.

968

968 = 23 × 112. It is a nontotient and an Achilles number.

969

969 = 3 × 17 × 19. It is a sphenic number, a nonagonal number,[59] and a tetrahedral number.[60]

970s

970

970 = 2 × 5 × 97. It is a sphenic number and a heptagonal number.

971

971 is a prime number, an emirp, a Chen prime, and an Eisenstein prime with no imaginary part.

972

972 = 22 × 35. It is a Harshad number[61] and an Achilles number.[62]

  • 972 has Anti-Factors = 5, 8, 24, 29, 67, 72, 216, 389, 648
  • The Sum of Anti-Factors of 972 = number * (n/2) where n is an Odd number. So, it is a Hemi-Anti-Perfect Number. Other such Numbers include 2692, etc.

Sum of Anti-Factors = 5 + 8 + 24 + 29 + 67 + 72 + 216 + 389 + 648 = 1458 = 972 * 3/2

973

973 = 7 × 139. It is a happy number.

974

974 = 2 × 487. It is a nontotient.

974! - 1 is prime.[63]

975

975 = 3 × 52 × 13.

976

976 = 24 × 61. It is a decagonal number.[64]

977

977 is a prime number, a balanced prime,[46] a Chen prime, an Eisenstein prime with no imaginary part, a Stern prime,[65] and the sum of nine consecutive primes (89 + 97 + 101 + 103 + 107 + 109 + 113 + 127 + 131). It is a strictly non-palindromic number.[66]

978

978 = 2 × 3 × 163. It is a sphenic number and a nontotient.

There are 978 secondary structures of RNA molecules with 11 nucleotides.[67]

979

979 = 11 × 89. It is the sum of the five smallest fourth powers: .

980s

980

980 = 22 × 5 × 72. There are 980 ways to tile a hexagon of edge 3 with calissons of side 1.[68]

981

981 = 32 × 109.

982

982 = 2 × 491.

983

983 is a prime number, a safe prime,[69] a Chen prime, and an Eisenstein prime with no imaginary part. It is a Wedderburn–Etherington number[70] and a strictly non-palindromic number.[66]

984

984 = 23 × 3 × 41.

985

985 = 5 × 197. It is a Markov number,[71] a Pell number,[72] a Smith number,[15] and the sum of three consecutive primes (317 + 331 + 337).

986

986 = 2 × 17 × 29. It is a sphenic number, a strobogrammatic number, and a nontotient. There are 986 unimodal compositions of 14 where the maximal part appears once.[73]

987

987 = 3 × 7 × 47. It is a deficient number, a sphenic number, and the 16th number of the Fibonacci sequence.[74] There are 987 partitions of 52 into prime parts.

988

988 = 22 × 13 × 19. It is a nontotient, a cake number, and the sum of four consecutive primes (239 + 241 + 251 + 257).

989

989 = 23 × 43. It is an extra strong Lucas pseudoprime.[75]

990s

990

990 = 2 × 32 × 5 × 11. It is a Harshad number, the 44th triangular number,[3] and the sum of six consecutive primes (151 + 157 + 163 + 167 + 173 + 179).

The highest possible VantageScore credit score is 990.

991

991 is a prime number, a Chen prime, a lucky prime, and a prime index prime. It is the sum of five consecutive primes (191 + 193 + 197 + 199 + 211) and the sum of seven consecutive primes (127 + 131 + 137 + 139 + 149 + 151 + 157).

992

992 = 25 × 31. It is a pronic number[30] and a nontotient. There are 992 eleven-dimensional exotic spheres.[76]

993

993 = 3 × 331.

994

994 = 2 × 7 × 71. It is a sphenic number and a nontotient. There are 994 binary words of length 13 with all distinct runs.[77]

995

995 = 5 × 199.

996

996 = 22 × 3 × 83.

997

997 is the largest three-digit prime number, a lucky prime, and a strictly non-palindromic number.[66]

998

998 = 2 × 499. It is a nontotient. There are 998 7-node graphs with two connected components.[78]

999

999 = 33 × 37. It is a Kaprekar number[79] and a Harshad number.

In many video games, 999 is the maximum score that can be displayed.

References

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  1. ↑ "Bowler throws 36 consecutive strikes for incredible 900 series". For The Win. 2016-01-13. Retrieved 2021-03-31.
  2. ↑ Sawan, Amer (2024-06-14). "How Old is Yoda in The Phantom Menace?". CBR. Retrieved 2025-04-19.
  3. 1 2 3 "Sloane's A000217: Triangular numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  4. ↑ Sloane, N. J. A. (ed.). "Sequence A036469 (Partial sums of A000009 (partitions into distinct parts))". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  5. ↑ "Sloane's A098237: Composite de Polignac numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-10.
  6. 1 2 Sloane, N. J. A. (ed.). "Sequence A006245 (Number of primitive sorting networks on n elements; also number of rhombic tilings of a 2n-gon)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-24.
  7. ↑ Sloane, N. J. A. (ed.). "Sequence A303546 (Number of non-isomorphic aperiodic multiset partitions of weight n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-24.
  8. ↑ Sloane, N. J. A. (ed.). "Sequence A020492 (Balanced numbers: numbers k such that phi(k) (A000010) divides sigma(k) (A000203))". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  9. ↑ Sloane, N. J. A. (ed.). "Sequence A007716 (Number of polynomial symmetric functions of matrix of order n under separate row and column permutations)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  10. 1 2 Vanovschi, Vitalii. "Properties of the number 911". www.numberempire.com. Retrieved 2026-08-23.
  11. ↑ Sloane, N. J. A. (ed.). "Sequence A068231 (Primes congruent to 11 mod 12)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  12. ↑ Sloane, N. J. A. (ed.). "Sequence A109611 (Chen primes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  13. ↑ Sloane, N. J. A. (ed.). "Sequence A062786 (Centered 10-gonal numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-02.
  14. ↑ Sloane, N. J. A. (ed.). "Sequence A001428 (Number of inverse semigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator))". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  15. 1 2 3 4 5 "Sloane's A006753 : Smith numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  16. ↑ Sloane, N. J. A. (ed.). "Sequence A332834 (Number of compositions of n that are neither weakly increasing nor weakly decreasing)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-23.
  17. ↑ "Sloane's A005282 : Mian-Chowla sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  18. ↑ "Sloane's A002407 : Cuban primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  19. ↑ "Sloane's A003215 : Hex (or centered hexagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  20. ↑ Sloane, N. J. A. (ed.). "Sequence A055544 (Total number of nodes in all rooted trees with n nodes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-23.
  21. ↑ Sloane, N. J. A. (ed.). "Sequence A301462 (Number of enriched r-trees of size n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-23.
  22. ↑ Sloane, N. J. A. (ed.). "Sequence A030662 (Number of combinations of n things from 1 to n at a time, with repeats allowed)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-23.
  23. ↑ "Sloane's A000984 : Central binomial coefficients". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  24. ↑ "Sloane's A000326 : Pentagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  25. ↑ "Sloane's A001844 : Centered square numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  26. ↑ "Sloane's A000073 : Tribonacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  27. ↑ "Sloane's A080076 : Proth primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  28. ↑ "Crack open your Bible: 929 day study project begins in Jerusalem". The Jerusalem Post. December 18, 2014. Retrieved January 1, 2015.
  29. ↑ ISO/IEC (2006), Information technology – Automatic identification and data capture techniques – PDF417 bar code symbology specification (PDF) (second ed.), ISO/IEC 15438:2006(E), archived from the original (PDF) on 2011-04-09, retrieved 2011-09-16
  30. 1 2 "Sloane's A002378 : Oblong (or promic, pronic, or heteromecic) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  31. ↑ Sloane, N. J. A. (ed.). "Sequence A319612 (Number of regular simple graphs spanning n vertices)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-23.
  32. ↑ Sloane, N. J. A. (ed.). "Sequence A295193 (Number of regular simple graphs on n labeled nodes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-22.
  33. ↑ "Sloane's A006972 : Lucas-Carmichael numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  34. ↑ "Sloane's A002411 : Pentagonal pyramidal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  35. ↑ "Sloane's A003154 : Centered 12-gonal numbers. Also star numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  36. ↑ Sloane, N. J. A. (ed.). "Sequence A018808 (Number of lines through at least 2 points of an n X n grid of points)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-22.
  37. ↑ Sloane, N. J. A. (ed.). "Sequence A161206 (V-toothpick (or honeycomb) sequence)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  38. ↑ Sloane, N. J. A. (ed.). "Sequence A001628 (Convolved Fibonacci numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  39. ↑ Sloane, N. J. A. (ed.). "Sequence A005727 (n-th derivative of x^x at x=1. Also called Lehmer-Comtet numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  40. ↑ "Sloane's A076980 : Leyland numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  41. ↑ Higgins, Peter (2008). Number Story: From Counting to Cryptography. New York: Copernicus. p. 13. ISBN 978-1-84800-000-1.
  42. ↑ "Sloane's A006038 : Odd primitive abundant numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  43. ↑ "Sloane's A006036 : Primitive pseudoperfect numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  44. ↑ "Sloane's A006882 : Double factorials". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  45. ↑ "Sloane's A000384 : Hexagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  46. 1 2 "Sloane's A006562 : Balanced primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  47. ↑ Sloane, N. J. A. (ed.). "Sequence A269134 (Number of combinatory separations of normal multisets of weight n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-13.
  48. ↑ Sloane, N. J. A. (ed.). "Sequence A001318 (Generalized pentagonal numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  49. ↑ "Sloane's A005891 : Centered pentagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  50. ↑ Sloane, N. J. A. (ed.). "Sequence A162328 (Number of reduced words of length n in the Weyl group D_17)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-12.
  51. ↑ Sloane, N. J. A. (ed.). "Sequence A007678 (Number of regions in regular n-gon with all diagonals drawn.)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-13.
  52. ↑ "Sloane's A005384 : Sophie Germain primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  53. ↑ "Sloane's A069099 : Centered heptagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  54. ↑ Sloane, N. J. A. (ed.). "Sequence A179230 (n-th derivative of x^(x^x) at x=1)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  55. ↑ (sequence A023359 in the OEIS)
  56. ↑ Sloane, N. J. A. (ed.). "Sequence A024816 (Antisigma(n): Sum of the numbers less than n that do not divide n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-11.
  57. ↑ "Sloane's A098237: Composite de Polignac numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-10.
  58. ↑ "Sloane's A016754 : Odd squares: a(n) = (2n+1)^2. Also centered octagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  59. ↑ "Sloane's A001106 : 9-gonal (or enneagonal or nonagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  60. ↑ "Sloane's A000292 : Tetrahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  61. ↑ Sloane, N. J. A. (ed.). "Sequence A005349 (Niven (or Harshad, or harshad) numbers: numbers that are divisible by the sum of their digits)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  62. ↑ Sloane, N. J. A. (ed.). "Sequence A052486 (Achilles numbers - powerful but imperfect: if n = Product(p_i^e_i) then all e_i > 1 (i.e., powerful), but the highest common factor of the e_i is 1, i.e., not a perfect power.)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  63. ↑ "A002982: Numbers n such that n! - 1 is prime". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-10.
  64. ↑ "Sloane's A001107 : 10-gonal (or decagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  65. ↑ "Sloane's A042978 : Stern primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  66. 1 2 3 "Sloane's A016038 : Strictly non-palindromic numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  67. ↑ Sloane, N. J. A. (ed.). "Sequence A004148 (Generalized Catalan numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  68. ↑ "A008793". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-10.
  69. ↑ "Sloane's A005385 : Safe primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  70. ↑ "Sloane's A001190 : Wedderburn-Etherington numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  71. ↑ "Sloane's A002559 : Markoff (or Markov) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  72. ↑ "Sloane's A000129 : Pell numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  73. ↑ Sloane, N. J. A. (ed.). "Sequence A006330 (Number of corners, or planar partitions of n with only one row and one column)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  74. ↑ "Sloane's A000045 : Fibonacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  75. ↑ "Sloane's A0217719 : Extra strong Lucas pseudoprimes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-11.
  76. ↑ "week164". Math.ucr.edu. 2001-01-13. Retrieved 2014-05-12.
  77. ↑ "A351016". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-10.
  78. ↑ "A275165". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-10.
  79. ↑ "Sloane's A006886 : Kaprekar numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-02.
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