Odd numbers n such that for every k >= 1, n*2^k - 1 has a divisor in the set {3, 5, 13, 17, 97, 241, 257}.

A263561

Odd numbers n such that for every k >= 1, n*2^k - 1 has a divisor in the set {3, 5, 13, 17, 97, 241, 257}.