68401domain: NAppears in sequencesStrong pseudoprimes to base 14.at n=18A020240Strong pseudoprimes to base 66.at n=25A020292Strong pseudoprimes to base 90.at n=22A020316a(n) = 76*n^2 + 1.at n=30A158767Expansion of Product_{k>=1} (1 + x^k)^A001001(k).at n=11A301777