全部/知识/精选数列OEIS · 精选数列15小时前更新HISTORY近 30 天历史柱高表示当天去重热搜数量‹›←→最新0030040050060070080090100110120130140150160170180190200210220230240250260271028102910301031100108/03—09/01 有历史数据01The prime numbers.精选检索顺序:1 · 编号:A000040 · 数列:2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, …(另有 46 项) · 关键词:core, nonn, nice, easy · 修订版本:1398_N. J. A. Sloane_02Fibonacci numbers: F(n) = F(n-1) + F(n-2) with F(0) = 0 and F(1) = 1.精选检索顺序:2 · 编号:A000045 · 数列:0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, …(另有 29 项) · 关键词:nonn, core, nice, easy, hear, changed · 修订版本:2589_N. J. A. Sloane_, 196403Coordination sequence for planar net 3.3.3.3.6 (also called the fsz net).精选检索顺序:3 · 编号:A250120 · 数列:1, 5, 9, 15, 19, 24, 29, 33, 39, 43, 48, 53, …(另有 51 项) · 关键词:nonn, nice, easy · 修订版本:179_N. J. A. Sloane_, Nov 23 201404a(n) = sigma(n), the sum of the divisors of n. Also called sigma_1(n).精选检索顺序:4 · 编号:A000203 · 数列:1, 3, 4, 7, 6, 12, 8, 15, 13, 18, 12, 28, …(另有 58 项) · 关键词:easy, core, nonn, nice, mult · 修订版本:641_N. J. A. Sloane_05d(n) (also called tau(n) or sigma_0(n)), the number of divisors of n.精选检索顺序:5 · 编号:A000005 · 数列:1, 2, 2, 3, 2, 4, 2, 4, 3, 4, 2, 6, …(另有 92 项) · 关键词:nonn, easy, core, nice, mult, hear, changed · 修订版本:626_N. J. A. Sloane_06Triangular numbers: a(n) = binomial(n+1,2) = n*(n+1)/2 = 0 + 1 + 2 + ... + n.精选检索顺序:6 · 编号:A000217 · 数列:0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, …(另有 42 项) · 关键词:nonn, core, easy, nice · 修订版本:2062_N. J. A. Sloane_07Euler totient function phi(n): count numbers <= n and prime to n.精选检索顺序:7 · 编号:A000010 · 数列:1, 1, 2, 2, 4, 2, 6, 4, 6, 4, 10, 4, …(另有 57 项) · 关键词:easy, core, nonn, mult, nice, hear · 修订版本:641_N. J. A. Sloane_08Catalan numbers: C(n) = binomial(2n,n)/(n+1) = (2n)!/(n!(n+1)!).精选检索顺序:8 · 编号:A000108 · 数列:1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, …(另有 19 项) · 关键词:core, nonn, easy, eigen, nice, changed · 修订版本:2250_N. J. A. Sloane_09a(n) is the number of partitions of n (the partition numbers).精选检索顺序:9 · 编号:A000041 · 数列:1, 1, 2, 3, 5, 7, 11, 15, 22, 30, 42, 56, …(另有 38 项) · 关键词:core, easy, nonn, nice · 修订版本:1233_N. J. A. Sloane_10The squares: a(n) = n^2.精选检索顺序:10 · 编号:A000290 · 数列:0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, …(另有 39 项) · 关键词:nonn, core, easy, nice, mult · 修订版本:916_N. J. A. Sloane_