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 A210062 #34 Sep 08 2022 08:46:01
%S A210062 1,1,2,3,4,5,6,6,7,8,9,10,11,11,12,13,14,15,16,17,17,18,19,20,21,22,
%T A210062 22,23,24,25,26,27,28,28,29,30,31,32,33,33,34,35,36,37,38,39,39,40,41,
%U A210062 42,43,44,44,45,46,47,48,49,50,50,51,52,53,54,55,55,56,57
%N A210062 Number of digits in 7^n.
%H A210062 Seiichi Manyama, <a href="/A210062/b210062.txt">Table of n, a(n) for n = 0..10000</a>
%F A210062 a(n) = A055642(A000420(n)) = A055642(7^n) = floor(log_10(10*(7^n))). [_Jonathan Vos Post_, Mar 23 2012]
%t A210062 Table[Length[IntegerDigits[7^n]], {n, 0, 100}] (* _T. D. Noe_, Mar 20 2012 *)
%o A210062 (Magma) [#Intseq(7^n): n in [0..67]]; // _Bruno Berselli_, Mar 22 2012
%Y A210062 Cf. A000420, A055642.
%Y A210062 Number of digits in b^n: A034887 (b=2), A034888 (b=3), A210434 (b=4), A210435 (b=5), A210436 (b=6), this sequence (b=7).
%K A210062 nonn,base,easy
%O A210062 0,3
%A A210062 _Luc Comeau-Montasse_, Mar 16 2012