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 A031154 #17 Mar 09 2024 18:39:44
%S A031154 2,5,15,65,235,665,2132,2335,6515,6665,23335,47162,66515,66665,67485,
%T A031154 233335,235065,666515,666665,2333335,6666515,6666665,23333335,
%U A031154 64980962,66666515,66666665,233333335,666666515,666666665,2333333335,5044357665
%N A031154 Numbers k such that k^2 contains only digits {2,4,5}.
%H A031154 Zhao Hui Du, <a href="/A031154/b031154.txt">Table of n, a(n) for n = 1..106</a>
%H A031154 Patrick De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>
%H A031154 Author?, <a href="http://web.archive.org/web/20080708203024/http://blue.kakiko.com/mmrmmr/htm/eqtn06.html">Source</a>(<a href="http://web.archive.org/web/20060426155831/http://blue.kakiko.com/mmrmmr/txt/eqtn06.txt">txt</a>)
%Y A031154 Cf. A031152.
%K A031154 nonn,base
%O A031154 1,1
%A A031154 _Patrick De Geest_
%E A031154 Extended and corrected by author Mar 15 2000
%E A031154 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 03 2005