16413457domain: NPropertiesPrimalityPrimeyesAppears in sequencesOdd integers n such that for every integer k>0, n*2^k-1 has a divisor in the set {3, 5, 7, 13, 19, 37, 109}.at n=7A244072Prime Riesel numbers p that are not Mersenne primes such that 2*p is a noncototient.at n=9A263958Prime numbersat n=1055960