30885

Appears in sequences

• Numbers k such that k*(k+1)-1 and k*(k+1)+1 are twin primes and k*(k+3)-1 and k*(k+3)+1 are also twin primes.at n=18A138303
• Number of 4-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero.at n=27A208598
• Number of partitions of n+7 with largest inscribed rectangle having area <= n.at n=32A218628
• Minimal index of order n Stanley's antimagic square composed of Smith numbers.at n=5A225133
• Triangle read by rows: T(n,k) = t(n-k, k); t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = x + 5.at n=16A257607
• Triangle read by rows: T(n,k) = t(n-k, k); t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = x + 5.at n=19A257607
• Number of n edge connected achiral planar maps with an external face in which all internal faces are triangles.at n=24A378342