4328459domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that remain prime through 5 iterations of function f(x) = 2x + 1.at n=22A023330Primes p such that 2p+1, 4p+3, 6p+5, 8p+7, 10p+9 are all primes.at n=13A107022Prime numbersat n=304685