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 A053968 #18 Aug 11 2024 14:41:32
%S A053968 24,26,76,869924,2582184474,75349689155076,75879284173334,
%T A053968 815816631091556424,881854102200458483334,2562353735836753390526
%N A053968 Numbers k such that k^2 contains only digits {5,6,7}.
%H A053968 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 A053968 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 A053968 H. Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#567">Squares consisted of 3 different digits</a>
%Y A053968 Cf. A053969.
%K A053968 nonn,base,more
%O A053968 1,1
%A A053968 _Patrick De Geest_, Mar 15 2000
%E A053968 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 03 2005
%E A053968 Two more terms from _Jon E. Schoenfield_, Sep 04 2006
%E A053968 Three more terms from Mishima's website added by _Max Alekseyev_, May 02 2011