244219domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that remain prime through 4 iterations of function f(x) = 5x + 2.at n=20A023313Primes that remain prime through 5 iterations of function f(x) = 5x + 2.at n=3A023341a(n) = 729*n^2 - 1016*n + 354.at n=18A157665Prime numbersat n=21563