64411776domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 1, 4, 6, 7 and 8.at n=35A137052Products of primitive roots when n is 2, 4, p^k, or 2p^k (with p an odd prime), for all other n the value is defined to be 1.at n=24A382221