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 A053974 #18 Sep 02 2024 01:20:40
%S A053974 3,83,264,836,3114,8167,98336,818333,828667,994836,9309617,984833336,
%T A053974 82885443167,948097937383,984879122886,2588184048685235767383,
%U A053974 99483516217346127185182923658937
%N A053974 Numbers k such that k^2 contains only digits {6,8,9}.
%H A053974 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 A053974 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#689">Sporadic tridigital solutions</a>
%Y A053974 Cf. A053975.
%K A053974 nonn,base,more
%O A053974 1,1
%A A053974 _Patrick De Geest_, Mar 15 2000
%E A053974 More terms from _Gareth McCaughan_, Jun 11 2004
%E A053974 a(16) from Mishima's website, added by _Max Alekseyev_, Nov 30 2017
%E A053974 a(17) from _Zhao Hui Du_, Apr 07 2024