145823domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that 1 + product of primes up to p is prime.at n=19A005234Beginnings of maximal chains of primes with five members (four links).at n=6A152868Primes of the form p^2 + q^2 + 21, where p and q are consecutive primes.at n=33A229075Prime numbersat n=13494