228341domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p for which p^i - 4 is prime for i = 1, 3 and 5.at n=27A243818Primes p for which p^i - 4 is prime for i = 1, 3, 5 and 7.at n=3A243861Prime numbersat n=20288