59520

Appears in sequences

• Number of 2 X 2 matrices with entries mod n and nonzero determinant.at n=15A005353
• Sum of divisors of superabundant numbers (A004394).at n=20A007626
• Coordination sequence for F_4 lattice.at n=10A019558
• a(n) = a(n-1) + a(n-2) + 1, with a(0) = 1 and a(1) = 12.at n=19A022326
• Denominators of continued fraction convergents to sqrt(959).at n=7A042857
• Numbers k such that k | sigma_3(k) - phi(k)^3.at n=26A055697
• Sum of divisors of Ramanujan's highly composite numbers, or sigma(A002182(n)).at n=21A063072
• Composite numbers k such that phi(k) divides sigma(k) - 2*k.at n=28A068412
• a(n) = (A114043(n) - 1)/2.at n=24A115005
• T(n,k) is the number of order-decreasing and order-preserving partial transformations (of an n-chain) of waist k (waist(alpha) = max(Im(alpha))).at n=60A145035
• Molecular topological indices of the cocktail party graphs.at n=15A181773
• a(n) = sum of divisors of A094348(n).at n=23A182941
• Numbers with prime factorization pqrs^7.at n=14A190473
• Number m that give records for the quotient between the maximum and minimum x's such that sigma(x)=m.at n=14A241854
• Numbers n such that sigma(n+sigma(n)) = 5*sigma(n).at n=3A246912
• Sum of divisors of the minimal numbers (A007416).at n=41A256259
• a(n) is the number of 2 X 2 matrices over Z_p with determinant in {1,-1} where p = prime(n).at n=10A262354
• Number of orthogonal 3 X 3 matrices over the ring Z/nZ.at n=30A264083
• Terms satisfy: a(2*n) = a(n)*b(n) and a(2*n+1) = a(n+1)*b(n) for n>=0 with a(0)=1, where A(x)^2 = Sum_{n>=0} b(n)*x^n and g.f. A(x) = Sum_{n>=0} a(n)*x^n.at n=14A265264
• Number of 2 X 2 matrices with entries in {0,1,...,n} with determinant = permanent with no entries repeated.at n=32A280058