3675197domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that remain prime through 4 iterations of function f(x) = 8x + 1.at n=23A023319Primes which remain prime through 5 iterations of function f(x) = 8x + 1.at n=4A023347Duplicate of A023347.at n=4A086128Prime numbersat n=261725