104537domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that remain prime through 4 iterations of function f(x) = 4x + 9.at n=28A023312Primes that remain prime through 5 iterations of function f(x) = 4x + 9.at n=10A023340Primes p such that q = p mod A001414(p-1) = p mod A001414(p+1) is prime.at n=44A339182Prime numbersat n=9979