71293domain: NPropertiesPrimalityPrimeyesAppears in sequencesSmallest odd prime p such that n = (p - 1) / ord_p(2).at n=38A101208Primes of the form 9n^2 + 4.at n=15A201706Numbers k such that k![4] - 4 is prime, where k![4] = A007662(k) = quadruple factorial.at n=44A328454Prime numbersat n=7058