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 A053938 #17 Aug 11 2024 14:41:32
%S A053938 2,6,8,58,2108,665908,682908,6583794,6814942,58622892,183475738,
%T A053938 79651953188,666585663238,2081740457806,66817996351009092,
%U A053938 6666680833328031344
%N A053938 Numbers k such that k^2 contains only digits {3,4,6}.
%H A053938 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 A053938 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 A053938 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#346">Sporadic tridigital solutions</a>
%Y A053938 Cf. A053939.
%K A053938 nonn,base,more
%O A053938 1,1
%A A053938 _Patrick De Geest_, Mar 15 2000
%E A053938 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 03 2005
%E A053938 One more term from _Jon E. Schoenfield_, Sep 04 2006
%E A053938 a(15)-a(16) from Mishima's website, added by _Max Alekseyev_, Nov 30 2017