10801000domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 0, 1, 5, 6 and 8.at n=40A136870Numbers k such that k and k^2 use only the digits 0, 1, 6, 7 and 8.at n=29A136876Numbers k such that k and k^2 use only the digits 0, 1, 6 and 8.at n=14A136878