39439domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form perfect_power(n)+n.at n=28A075781Primes having only {3, 4, 9} as digits.at n=33A199349Primes of the form abcabc..abcab.at n=32A228627Primes p such that A001175(p) = (p-1)/9.at n=20A308794Primes p such that A001177(p) = (p-1)/9.at n=12A308802Prime numbersat n=4151