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 A067472 #6 Apr 18 2021 14:57:09
%S A067472 25,225,2025,20164,200704,2002225,20007729,200024449,2000057284,
%T A067472 20000182084,200000361796,2000001237796,20000000402496,
%U A067472 200000010642496,2000000040249600,20000000215721449,200000000447251216
%N A067472 Smallest n-digit square starting with 2.
%F A067472 a(n) = ceiling(sqrt(2*10^(n-1)))^2, n>1. - _Rick L. Shepherd_, Feb 14 2002
%t A067472 Table[Ceiling[Sqrt[2*10^(n-1)]]^2,{n,2,30}] (* _Harvey P. Dale_, Apr 18 2021 *)
%o A067472 (PARI) for(n=2,25,a=ceil(sqrt(2*10^(n-1)))^2; print(a))
%Y A067472 Cf. A035069 (roots), A045785, A067479 (2..9).
%K A067472 base,easy,nonn
%O A067472 2,1
%A A067472 _Amarnath Murthy_, Feb 09 2002
%E A067472 More terms from _Rick L. Shepherd_, Feb 14 2002