500755domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 0, 2, 3, 5 and 7.at n=46A136889Numbers k such that k and k^2 use only the digits 0, 2, 5 and 7.at n=21A136915Numbers k such that k and k^2 use only the digits 0, 2, 5, 7 and 8.at n=47A136916