23639

Appears in sequences

• Numbers k such that 2^k + 9 is prime.at n=46A057196
• Number of 3 x n binary matrices without unit columns up to row and column permutations.at n=39A057524
• Indices of primes in sequence defined by A(0) = 83, A(n) = 10*A(n-1) + 63 for n > 0.at n=22A101079
• Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-0001-0001 pattern in any orientation.at n=14A147394
• Number of compositions of n avoiding the pattern 111.at n=20A232432
• Number of length n+7 0..1 arrays with at most one downstep in every n consecutive neighbor pairs.at n=40A255998
• Number of series-reduced anti-binary (no unary or binary branchings) unlabeled rooted trees with n nodes.at n=25A303025
• Number of terms in polynomial sequence s(n) = x*y*z*(s(n-1)*s(n-3) + s(n-2)^2)/s(n-4), with s(1) = x, s(2) = s(3) = 1, s(4) = y.at n=25A338218