53287

Appears in sequences

• Numbers k such that 2*10^k + 3*R_k + 6 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=19A102951
• Number of nondecreasing integer sequences of length 26 with sum zero and sum of absolute values 2n.at n=15A158160
• E.g.f. A(x) satisfies A(x) = exp(x * (1+x^2)^2 * A(x)).at n=6A387013