240937domain: NAppears in sequencesNumbers k such that 5*2^k + 1 is prime.at n=20A002254Numbers n such that 5*2^n + 1 is a prime factor of a generalized Fermat number 3^(2^m) + 1 for some m.at n=4A268661Numbers k such that 5*2^k + 1 is a prime factor of a generalized Fermat number 11^(2^m) + 1 for some m.at n=3A282946