2333524235domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 2, 3, 4 and 5.at n=11A137066Numbers k such that k and k^2 use only the digits 2, 3, 4, 5 and 7.at n=20A137068Numbers n such that the decimal expansions of both n and n^2 have 2 as smallest digit and 5 as largest digit.at n=9A257310