427924domain: NAppears in sequencesNumber of double tangents of order n.at n=31A060784Numbers k such that sigma(k) = bigomega(k) * phi(k).at n=31A067238Numbers n such that sigma(n) = 6*phi(n).at n=29A104900Number of n X 6 binary arrays without the pattern 0 1 diagonally or vertically.at n=17A188840