616079domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that p^4 + p - 1, p^4 + p^2 - 1, p^4 + p^3 - 1 are also prime.at n=31A226938Primes p such that p - 1 and (p + 1)/2 have the same sum of divisors.at n=7A249511Prime numbersat n=50312