163327domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers to which Mersenne primes 2^p-1 can be congruent mod k! (for k > 1).at n=21A145038Numerator of Bernoulli(n, -7/8).at n=4A158788Primes which are the concatenation of a prime p and 2p+1.at n=11A168166Prime numbersat n=14959