4974971domain: NAppears in sequencesComposite numbers m such that (4^m - 2^m + 8*m^2 - 2) / (2*m*(2*m + 1)) is an integer.at n=23A235540Fermat pseudoprimes to base 2 that are tetradecagonal.at n=11A322123Lucasian pseudoprimes: composite numbers k such that 2^(k-1) == k+1 (mod k(2k+1)).at n=4A343679