50523

Appears in sequences

• Least k such that gcd(prime(k)+1, prime(k+1)+1) = 2n.at n=39A067603
• Expansion of e.g.f. exp(2x)*sech(x).at n=10A119880
• a(n) = A000111(n) + A014695(n).at n=10A141479
• Expansion of 1/(x^k*(1-x-2*x^(k+1))) for k=9.at n=43A143452
• Expansion of phi(x^2) * chi(x)^4 in powers of x where phi(), chi() are Ramanujan theta functions.at n=28A260515
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 150", based on the 5-celled von Neumann neighborhood.at n=23A279249
• A Seidel matrix A(n,k) read by antidiagonals downwards.at n=65A323834
• Composite numbers k coprime to 13 such that k divides A006190(k-Kronecker(13,k)).at n=37A327653
• Expansion of the exponential generating function (tanh(x) - sech(x) + 1) * exp(x).at n=10A342161
• Position of second appearance of 2n in the sequence of prime gaps A001223; if 2n does not appear at least twice, a(n) = -1.at n=39A356221
• a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(4*n-2*k-3,n-2*k).at n=6A390682