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 A031153 #19 Mar 09 2024 09:46:48
%S A031153 1,5,11,15,35,39,235,335,461,715,1235,1585,2261,2285,3335,12335,33335,
%T A031153 33989,34965,72285,123335,333335,1101011,1233335,3333335,11054965,
%U A031153 12333335,14579285,33333335,105934485,123333335,333333335
%N A031153 Numbers k such that k^2 contains only digits {1,2,5}.
%H A031153 Zhao Hui Du, <a href="/A031153/b031153.txt">Table of n, a(n) for n = 1..113</a>
%H A031153 Patrick De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>
%Y A031153 Cf. A031151, A034905.
%K A031153 nonn,base
%O A031153 1,2
%A A031153 _Patrick De Geest_
%E A031153 Corrected and extended by _Patrick De Geest_, Mar 15 2000