24105

Appears in sequences

• Numbers k such that 15*2^k + 1 is prime.at n=33A002258
• Sum of n-th row of triangle of 4th powers: 1; 1 16 1; 1 16 81 16 1; 1 16 81 256 81 16 1; ... (cf. A133824).at n=8A061803
• Number of self-dual combinatorial configurations of type (n_3).at n=15A100001
• Binomial transform of [1, 3, 4, 3, 2, 0, 0, 0, ...].at n=23A136395
• a(n) = Sum_{i=0..n} digsum_9(i)^4, where digsum_9(i) = A053830(i).at n=17A231687
• a(n) = Sum_{i=0..n} digsum(i)^4, where digsum(i) = A007953(i).at n=17A231689
• G.f. satisfies: A(x) = (1+x+x^2) * A(x^2)^2.at n=37A237651
• Numbers k such that (k*2^d + 1)*(d*2^k + 1) is semiprime for some divisor d of k.at n=16A382887