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 A016686 #19 May 15 2019 01:33:59
%S A016686 4,1,4,3,1,3,4,7,2,6,3,9,1,5,3,2,6,8,7,8,9,5,8,4,3,2,1,7,2,8,8,2,3,1,
%T A016686 1,3,8,9,3,2,0,6,5,8,4,5,2,2,7,3,6,0,0,9,1,9,2,8,7,7,8,8,1,7,2,1,2,5,
%U A016686 6,8,4,4,9,1,8,9,2,8,7,2,0,1,5,3,4,8,9,0,0,0,8,2,1,5,3,3,5,7,0
%N A016686 Decimal expansion of log(63).
%D A016686 M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, 1964 (and various reprintings), p. 2.
%H A016686 Harry J. Smith, <a href="/A016686/b016686.txt">Table of n, a(n) for n = 1..20000</a>
%H A016686 M. Abramowitz and I. A. Stegun, eds., <a href="http://www.convertit.com/Go/ConvertIt/Reference/AMS55.ASP">Handbook of Mathematical Functions</a>, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].
%H A016686 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%e A016686 4.143134726391532687895843217288231138932065845227360091928778817212568...
%t A016686 RealDigits[Log[63],10,120][[1]] (* _Harvey P. Dale_, Jul 11 2014 *)
%o A016686 (PARI) default(realprecision, 20080); x=log(63); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b016686.txt", n, " ", d)); \\ _Harry J. Smith_, May 22 2009
%Y A016686 Cf. A016491 Continued fraction.
%K A016686 nonn,cons
%O A016686 1,1
%A A016686 _N. J. A. Sloane_