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 A058472 #11 Mar 14 2025 20:03:25
%S A058472 9,98989978877879888789778997998889
%N A058472 Squares composed of digits {7,8,9}.
%H A058472 Patrick De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Index to related sequences</a>
%H A058472 Shyam Sunder Gupta, <a href="https://doi.org/10.1007/978-981-97-2465-9_2">Elegance of Squares, Cubes, and Higher Powers</a>, Exploring the Beauty of Fascinating Numbers, Springer (2025) Ch. 2, 29-81.
%H A058472 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#789">Sporadic tridigital solutions</a>
%F A058472 a(n) = A058471(n)^2.
%Y A058472 Cf. A058471.
%K A058472 nonn,base,hard,more,bref
%O A058472 1,1
%A A058472 _Patrick De Geest_, Nov 15 2000