17941

Appears in sequences

• Number of trees of diameter 4.at n=36A000094
• 4-dimensional analog of centered polygonal numbers: a(n) = n(n+1)*(n^2+n+4)/12.at n=21A006007
• a(n) = Sum_{k=1..n} k*phi(k).at n=43A011755
• Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,3,2.at n=5A037684
• Centered 23-gonal numbers.at n=39A069174
• An interleaved sequence of pyramidal and polygonal numbers.at n=41A081283
• a(n) = n*(n^3-n^2+n+1)/2.at n=14A100855
• a(n) = n*(n+1)*(n^2 + 21*n + 50)/24.at n=20A101854
• Number of forests of rooted trees with total weight n, where a node at height k has weight 2^k (with root considered to be at height 0).at n=40A115593
• a(n) = 12*n^2 - 8*n + 1.at n=39A185212
• A071963(n) - n, where A071963(n) is the largest prime factor of p(n), the n-th partition number A000041(n).at n=36A192885
• Number of 2n X 2 0..2 arrays with values 0..2 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.at n=5A198447
• T(n,k)=Number of 2nX2k 0..2 arrays with values 0..2 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.at n=15A198452
• T(n,k)=Number of 2nX2k 0..2 arrays with values 0..2 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.at n=20A198452
• Numbers n such that n^10+10 is prime.at n=28A239347
• Square table read by upwards antidiagonals: T(m,n) = A103438(2*m-1,n)/A103438(1,n) for m>=1, n>=1.at n=41A339019
• Odd composite integers m such that A000032(3*m-J(m,5)) == 3*J(m,5) (mod m), where J(m,5) is the Jacobi symbol.at n=23A339724
• Odd composite integers m such that A001906(m-J(m,5)) == 0 (mod m) and gcd(m,5)=1, where J(m,5) is the Jacobi symbol.at n=32A340097
• Odd composite integers m such that A004187(m-J(m,45)) == 0 (mod m) and gcd(m,45)=1, where J(m,45) is the Jacobi symbol.at n=33A340099
• Numbers k such that A361338(k) = 9.at n=37A361348