This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A029775 #27 Aug 26 2024 09:55:44
%S A029775 0,1,100,10000,55225,1000000,1100401,1525225,5522500,8898289,22676644,
%T A029775 23348224,100000000,107661376,110040100,110103049,110166016,119311929,
%U A029775 125552025,152152225,152522500,153388225,155002500,160022500,204204100,219899241,262602025
%N A029775 Squares k^2 whose digits appear in k.
%H A029775 Robert Israel, <a href="/A029775/b029775.txt">Table of n, a(n) for n = 1..10000</a>
%F A029775 a(n) = A029774(n)^2. - _Sean A. Irvine_, Mar 04 2020
%e A029775 The digits of 55225 (= 235^2) are a subset of {2,3,5}.
%p A029775 filter:= proc(k) convert(convert(k^2,base,10),set) subset convert(convert(k,base,10),set) end proc:
%p A029775 map(t -> t^2, select(filter, [$0..10^5])); # _Robert Israel_, Aug 25 2024
%Y A029775 Cf. A029774.
%K A029775 nonn,base
%O A029775 1,3
%A A029775 _Patrick De Geest_
%E A029775 Title improved and more terms from _Sean A. Irvine_, Mar 04 2020