56672

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 17.at n=13A031695
• Triangle read by rows: T(n,k) is the number of permutations of an n-set having k cycles of size > 1 (0<=k<=floor(n/2)).at n=28A136394
• a(n) = n*(n-1)*(n+1)*(3*n-2)/12.at n=21A153978
• a(n) = 289n^2 + 2n.at n=13A158254
• a(n) = n*(n+1)*(5*n+1)/3.at n=32A174814
• [s(k)-s(j)]/9, where the pairs (k,j) are given by A205872 and A205873, and s(k) denotes the (k+1)-st Fibonacci number.at n=37A205875
• Number of elements of order n in simple Mathieu group M_23.at n=2A284872
• Number of elements of order n in the simple unitary group U2(5).at n=2A284984
• Number of permutations of [n] having exactly three nontrivial cycles.at n=3A289951
• Expansion of x * (d/dx) 1/(1 - Sum_{k>=1} x^k/(1 + x^k)).at n=16A304907
• Numbers m such that m^2 + p^2 = k^2, with p > 0, where p = A007954(m) = the product of digits of m.at n=14A334558
• E.g.f. A(x) satisfies A(A(A(A(x)))) = (-1/8) * log(1 - 8*x).at n=6A372796