331801domain: NPropertiesPrimalityPrimeyesAppears in sequencesFirst member of a prime 5-tuple in a 2p-1 progression.at n=20A057328First member of a prime sextuplet in a 2p-1 progression.at n=3A057329Primes of the form n^4 + n + 1 with n positive.at n=8A272571Prime numbersat n=28549