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 A058456 #19 Jul 18 2025 19:32:15
%S A058456 9,80089,90809009099908808089808090889,
%T A058456 89898988900998890088080098089989880890999988989999809
%N A058456 Squares composed of digits {0,8,9}, not ending with zero.
%H A058456 Patrick De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>.
%H A058456 Hisanori Mishima, <a href="https://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#089">Sporadic tridigital solutions</a>.
%F A058456 a(n) = A058455(n)^2. - _Elmo R. Oliveira_, Jul 18 2025
%Y A058456 Cf. A058455.
%K A058456 nonn,base,more
%O A058456 1,1
%A A058456 _Patrick De Geest_, Nov 15 2000
%E A058456 a(4) from _Zhao Hui Du_, Feb 28 2024