2481113domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes 2 less than a tetrahedral number.at n=14A162904Primes p such that f(p), f(f(p)), f(f(f(p))), and f(f(f(f(p)))) are all prime, where f(x) = x^2+3x+1.at n=2A244113Prime numbersat n=181788