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 A053960 #15 Aug 11 2024 14:41:32
%S A053960 2,3,7,8,212,264,2236,3114,3157,31614,68187,254842,80434114,263527313,
%T A053960 3073591864,6670791907,21134016762,21610059386,97312381892,
%U A053960 22237232291063,999997323321167445187,22236561446627600040614,9718263579193026119075264
%N A053960 Numbers k such that k^2 contains only digits {4,6,9}.
%H A053960 P. De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>
%H A053960 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>)
%H A053960 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#469">Sporadic tridigital solutions</a>
%Y A053960 Cf. A053961.
%K A053960 nonn,base
%O A053960 1,1
%A A053960 _Patrick De Geest_, Mar 15 2000
%E A053960 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 03 2005
%E A053960 a(20)-a(23) from Mishima's website, added by _Max Alekseyev_, Nov 30 2017