26690

Appears in sequences

• Triangle of (Gaussian) q-binomial coefficients for q = -13.at n=12A015129
• Gaussian binomial coefficient [ n,2 ] for q = -13.at n=2A015265
• Solutions to A096509[x]=6; number of prime-powers [including primes] in the neighborhood of x with Ceiling[Log[x]] radius equals 6.at n=26A096517
• Numbers n such that n+(n+1), n^2+(n+1)^2, n+(n+1)^2, n^2+(n+1) are all prime.at n=32A216270
• Numbers that can be represented as a sum of two distinct nontrivial prime powers in three or more ways.at n=27A225104
• Numbers which are the sum of two squared primes in exactly three ways (ignoring order).at n=10A226562
• Numbers k such that k and k+1 are the product of exactly four distinct primes.at n=26A318896
• a(n) = sigma_2(n)*sigma_3(n)/sigma(n).at n=12A320917
• Numbers k such that there are exactly 9 numbers j for which binomial(k, floor(k/2)) / binomial(k,j) is an integer, i.e., A080383(k) = 9.at n=7A327431