211411domain: NAppears in sequencesStrong pseudoprimes to base 3.at n=30A020229Strong pseudoprimes to base 56.at n=30A020282Describe previous term from the right (method A - initial term is 4).at n=3A022508Overpseudoprimes to base 3.at n=15A141350Composite numbers k == 5, 7 (mod 12) such that 3^((k-1)/2) == -1 (mod k).at n=14A375918