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 A058452 #12 Jul 18 2025 22:02:26
%S A058452 9,69696,660969,9696996,6600069696900969,69096090900990609,
%T A058452 900006066606660060090966606696996,
%U A058452 609660999069000006699096996606066090996096009966990996609
%N A058452 Squares composed of digits {0,6,9}, not ending with zero.
%H A058452 Patrick De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>.
%H A058452 Hisanori Mishima, <a href="https://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#069">Sporadic tridigital solutions</a>.
%F A058452 a(n) = A058451(n)^2. - _Elmo R. Oliveira_, Jul 18 2025
%Y A058452 Cf. A058451.
%K A058452 nonn,base,more
%O A058452 1,1
%A A058452 _Patrick De Geest_, Nov 15 2000
%E A058452 a(8) from _Zhao Hui Du_, Mar 11 2024