356929domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p for which p^i + 4 is prime for i = 1, 3 and 5.at n=28A243780Primes p for which p^i + 4 is prime for i = 1, 3, 5 and 7.at n=3A243859Prime numbersat n=30515