257251domain: NAppears in sequencesList of pairs of primes in reverse order, starting at 1.at n=27A007796a(n) = 6n^3 + 1, solution z in Diophantine equation x^3 + y^3 = z^3 - 2. It may be considered a Fermat near miss by 2.at n=34A163827Semiprimes that are the concatenation of a prime and the previous prime.at n=16A242102