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 A069658 #9 Mar 08 2022 12:50:32
%S A069658 1,16,121,1024,10201,100489,1002001,10004569,100020001,1000014129,
%T A069658 10000200001,100000147984,1000002000001,10000002149284,
%U A069658 100000020000001,1000000025191729,10000000200000001,100000000621806289,1000000002000000001
%N A069658 a(1) = 1; a(n) = smallest nontrivial n-digit perfect power.
%C A069658 Powers of 10 are not allowed.
%F A069658 a(n) = (floor(sqrt(10)^(n-1))+1)^2 = (A017934(n-1)+1)^2. - _Vladeta Jovovic_, Jun 30 2002
%t A069658 Join[{1},(Floor[Sqrt[10^Range[20]]]+1)^2] (* _Harvey P. Dale_, Mar 08 2022 *)
%Y A069658 Cf. A061432, A017936.
%K A069658 nonn,base
%O A069658 1,2
%A A069658 _Amarnath Murthy_, Apr 04 2002
%E A069658 More terms from _Sascha Kurz_, Jan 28 2003