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 A069668 #10 Dec 04 2021 02:34:46 %S A069668 1,25,121,2401,10201,301401,1002001,25010001,100020001,2500100001, %T A069668 10000200001,250001000001,1000002000001,25000010000001, %U A069668 100000020000001,2500000100000001,10000000200000001,250000001000000001 %N A069668 Largest nontrivial (no trailing zeros) n-digit square with minimum digit sum. %Y A069668 Cf. A069661, A069662, A069663, A069664, A069665, A069666. %K A069668 nonn,base %O A069668 1,2 %A A069668 _Amarnath Murthy_, Apr 06 2002 %E A069668 Corrected and extended by Larry Reeves (larryr(AT)acm.org), Oct 15 2003