272777777domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes with exactly seven 7's.at n=15A178556Primes p such that digits of p do not appear in p^4.at n=19A253574Primes whose digits are all prime, sum of digits is prime and sum of reciprocals of digits is also prime.at n=8A269930Prime numbersat n=14854288