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 A067474 #16 Jun 03 2025 01:09:38
%S A067474 4,49,400,4096,40000,400689,4000000,40005625,400000000,4000056516,
%T A067474 40000000000,400000591936,4000000000000,40000008597136,
%U A067474 400000000000000,4000000100766916,40000000000000000,400000001222314089,4000000000000000000,40000000008389413041
%N A067474 Smallest n-digit square starting with 4.
%F A067474 a(n) = ceiling(sqrt(4*10^(n-1)))^2. - _Rick L. Shepherd_, Feb 18 2002
%t A067474 nS[n_] := Module[{i = Floor[Sqrt[n]]}, If[i^2==n, i^2, (i + 1)^2]]; Table[nS[4 10^i], {i, 0, 25}]
%o A067474 (PARI) for(n=1,20,a=ceil(sqrt(4*10^(n-1)))^2; print(a))
%Y A067474 Cf. A000290, A035071 (roots), A045787, A067479 (2..9).
%K A067474 nonn,base,easy
%O A067474 1,1
%A A067474 _Amarnath Murthy_, Feb 09 2002
%E A067474 More terms from _Rick L. Shepherd_, Feb 18 2002