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 A048354 #20 Mar 06 2025 10:54:02
%S A048354 3,63,173,1414,17313,53937,138923,953937,3082207,31622764,99849687,
%T A048354 301579177,3033150173,14142134563,141413973847,543315746063,
%U A048354 3098361825223,5477225574409,14139412282687,314896807700437,412286308285783,3147904051904219,9055381813816577,311447546136054827,282841298257395573
%N A048354 a(n)^2 is the smallest square containing exactly n 9's.
%H A048354 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SquareNumber.html">Square Number</a>
%t A048354 a[n_]:=Module[{i},i=1;While[DigitCount[i^2][[9]]!=n,i++ ];i]; (* Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 23 2006 *)
%Y A048354 Cf. A036516, A034994.
%K A048354 nonn,base
%O A048354 1,1
%A A048354 _Patrick De Geest_, Mar 15 1999
%E A048354 a(13)-a(15) from _Jon E. Schoenfield_, Jan 24 2009
%E A048354 a(16) from _Jon E. Schoenfield_, Jan 25 2009
%E A048354 a(17)-a(19) from _Giovanni Resta_, Jul 27 2018
%E A048354 a(20)-a(25) from _Max Alekseyev_, Mar 06 2025