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 A035071 #13 Oct 13 2019 23:10:28
%S A035071 2,7,20,64,200,633,2000,6325,20000,63246,200000,632456,2000000,
%T A035071 6324556,20000000,63245554,200000000,632455533,2000000000,6324555321,
%U A035071 20000000000,63245553204,200000000000,632455532034,2000000000000
%N A035071 a(n) = ceiling(sqrt(4*10^n)).
%C A035071 Previous name: "a(n) is root of square starting with digit 4: first term of runs."
%t A035071 Table[Ceiling @ Sqrt[4 * 10^n], {n, 0, 24}] (* _Amiram Eldar_, Oct 08 2019 *)
%Y A035071 Cf. A067474 (squares), A035076 (2..9).
%K A035071 nonn,base
%O A035071 0,1
%A A035071 _Patrick De Geest_, Nov 15 1998