15801601domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p with f(p), f(f(p)), f(f(f(p))), f(f(f(f(p)))), f(f(f(f(f(p))))) all prime, where f(n) = prime(n) - n + 1.at n=14A235984Prime numbersat n=1019104