10309889domain: NPropertiesPrimalityPrimeyesAppears in sequencesInitial (unsafe) primes of Cunningham chains of first type with length exactly 7.at n=4A059767Primes p such that 2p+1, 4p+3, 6p+5, 8p+7, 10p+9 are all primes.at n=24A107022Numbers n such that n remains prime through 6 iterations of function f(x) = 2x + 1.at n=4A278932Prime numbersat n=683783