124235domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 1, 2, 3, 4 and 5.at n=34A136968Numbers k such that the decimal expansions of both k and k^2 have 1 as smallest digit and 5 as largest digit.at n=11A256889Zeroless numbers n such that n and n^2 have the same set of decimal digits.at n=20A257763