958049domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes which can be expressed as sum of distinct powers of 7.at n=14A077721Primes that become squares when prefixed with an 8.at n=28A167741Primes whose base-7 representation also is the base-2 representation of a prime.at n=12A235464Prime numbersat n=75477