8879993domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrime values of n for which n*2^k + 1 is composite for all positive integers k.at n=18A137715Odd integers n such that for every integer k>0, n*2^k+1 has a divisor in the set { 3, 5, 7, 13, 17, 97, 257 }.at n=2A244566Prime numbersat n=594972