24995

Appears in sequences

• Numbers k such that 15*2^k + 1 is prime.at n=34A002258
• a(n) = [ a(n-1)/a(1) + a(n-3)/a(3) + a(n-5)/a(5) + ... ], for n >= 3.at n=32A022865
• Composite numbers, not ending with 0, sharing a 3-digit sequence with some of its prime factors.at n=31A131523
• Number of imprimitive transitive permutation groups of degree n.at n=23A132221
• Number of n X n binary arrays with all ones connected only in a 10000-11111-10000 pattern in any orientation.at n=8A147075
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 10000-11111-10000 pattern in any orientation.at n=19A147077
• Number of (n+2)X5 0..2 matrices with each 3X3 subblock idempotent.at n=14A224601
• T(n,m) is the numerator of the resistance between two nodes located at the end of a side of length n of a rectangular electric network of n*m quadratic meshes in which all edges are replaced by one-ohm resistors, where T(n,m) is a square array read by descending antidiagonals.at n=43A357115
• a(n) is the smallest k such that the sum of the first k primes has exactly n prime factors, counting multiplicity.at n=16A385997