1034641domain: NAppears in sequencesProduct p*q of two primes with q = 2*p + 1.at n=31A156592Numbers n such that A229964(n) = 1.at n=34A229965Triangular numbers that are the product of two distinct prime numbers of the form 4*k + 3.at n=16A365849Triangular numbers that are emirpimes.at n=23A375385