299767domain: NAppears in sequencesSemiprimes sp of the form p^2 + q + 1 where p and q are consecutive primes.at n=34A242243Integers n such that p = 4n + 1, q = 4p + 3, r = 4q + 5, s = 4r + 7 and t = 4s + 9 are all prime.at n=17A243528