77248

Appears in sequences

• Number of ways to place a non-attacking white and black bishop on n X n chessboard.at n=16A035288
• Smallest k such that k and k+n have the same prime signature that is different from all previous terms.at n=25A085876
• G.f. satisfies: A(x) = Sum_{n>=0} x^n*A(x)^[n*phi] where phi = (1+sqrt(5))/2.at n=10A186576
• Number of -n..n arrays x(0..3) of 4 elements with zero sum, and adjacent elements not equal modulo three (with -1 modulo 3 = 2).at n=35A199911
• Expansion of (elliptic_K / elliptic_E)^(1/2) in powers of q.at n=12A261979
• Bi-unitary deficient-perfect numbers: bi-unitary deficient numbers k for such that 2*k - bsigma(k) is a bi-unitary divisor of k, where bsigma(k) is the sum of bi-unitary divisors of k (A188999).at n=36A303358