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 A077429 #11 Sep 17 2020 13:25:23
%S A077429 0,0,0,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,
%T A077429 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
%U A077429 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4
%N A077429 a(n) = floor(log_10(n^2)).
%C A077429 a(n) = A004216(n^2).
%t A077429 Table[Floor[Log10[n^2]],{n,120}] (* _Harvey P. Dale_, Sep 17 2020 *)
%Y A077429 Cf. A004216, A077430.
%K A077429 nonn
%O A077429 1,10
%A A077429 _Reinhard Zumkeller_, Nov 05 2002