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 A065736 #17 Dec 13 2024 12:38:36
%S A065736 9,100,961,10000,99856,1000000,9998244,100000000,999950884,
%T A065736 10000000000,99999515529,1000000000000,9999995824729,100000000000000,
%U A065736 999999961946176,10000000000000000,99999999989350756,1000000000000000000,9999999998935075600,100000000000000000000,999999999956753113201
%N A065736 Largest square <= 10^n.
%H A065736 Harry J. Smith, <a href="/A065736/b065736.txt">Table of n, a(n) for n = 1..100</a>
%F A065736 a(n) = A048760(A011557(n)) = A048760(10^n).
%t A065736 Table[Floor[Sqrt[10^n]]^2,{n,20}] (* _Harvey P. Dale_, Dec 04 2014 *)
%o A065736 (PARI) a(n) = { sqrtint(10^n)^2 } \\ _Harry J. Smith_, Oct 28 2009
%Y A065736 Cf. A048760, A011557, A065730-A065741.
%K A065736 easy,nonn
%O A065736 1,1
%A A065736 _Labos Elemer_, Nov 15 2001