98726

Appears in sequences

• Numbers k such that the Woodall number k*2^k - 1 is prime.at n=23A002234
• Triangle read by rows: T(n,k) = number of connected n-node graphs with k nodes in distinguished bipartite block, k = 0..n.at n=83A363845
• Triangle read by rows: T(n,k) = number of connected n-node graphs with k nodes in distinguished bipartite block, k = 0..n.at n=85A363845
• Numbers k such that (k*2^d - 1)*(d*2^k - 1) is semiprime for some divisor d of k.at n=53A382646