150959domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p with p + 2, prime(p) + 2 and prime(prime(p)) + 2 all prime.at n=19A236481SanD-68 primes p: such that p+d is also prime and sum of digits A007953(p(p+d)) = d, with d = 68.at n=25A307474Prime numbersat n=13928