759360domain: NAppears in sequencesa(n) = n^5 - n.at n=15A061167Numbers whose set of base 15 digits is {0,E}, where E base 15 = 14 base 10.at n=30A097261Numbers n such that sigma(tau(phi(n))) = tau(phi(sigma(n))) = phi(sigma(tau(n))).at n=21A218006