41626domain: NAppears in sequencesNumbers k such that the continued fraction for sqrt(k) has period 71.at n=36A020410a(n) = 4 + 8*n + 10*n^2 + 4*n^3.at n=21A100207Numbers n such that n''' = n''+ 1 where n'' and n''' are respectively the second and the third arithmetic derivative of n.at n=12A189941