1393920domain: NAppears in sequencesNumber of pluperfect Latin squares of order n.at n=5A108395Numbers n = 5*k^2 such that n - 1 and n + 1 are (twin) primes (thus k=6*m).at n=11A154672Numbers k such that A051378(k) > 2*k and A333926(k) <= 2*k.at n=22A349284