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 A016587 #27 Sep 08 2022 08:44:41
%S A016587 2,3,5,1,3,7,5,2,5,7,1,6,3,4,7,7,6,8,7,0,8,3,3,6,5,8,5,8,9,0,7,5,2,8,
%T A016587 8,6,6,2,0,9,0,7,5,1,5,3,0,4,4,3,5,5,3,8,6,0,7,3,4,0,4,4,7,4,0,8,1,6,
%U A016587 8,0,5,3,4,0,0,0,9,8,3,5,1,9,0,5,5,4,1,0,9,2,6,4,0,5,1,8,4,9,2
%N A016587 Decimal expansion of log(21/2).
%H A016587 Harry J. Smith, <a href="/A016587/b016587.txt">Table of n, a(n) for n = 1..20000</a>
%H A016587 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%F A016587 Equals A016644 - A002162. - _Michel Marcus_, Apr 07 2020
%e A016587 2.351375257163477687083365858907528866209075153044355386073404474081680...
%t A016587 RealDigits[Log[21/2], 10, 120][[1]] (* _Vincenzo Librandi_, Apr 07 2020 *)
%o A016587 (PARI) default(realprecision, 20080); x=log(21/2); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b016587.txt", n, " ", d)); \\ _Harry J. Smith_, May 26 2009
%o A016587 (Magma) SetDefaultRealField(RealField(100)); Log(21/2); // _Vincenzo Librandi_, Apr 07 2020
%Y A016587 Cf. A016538 (continued fraction).
%Y A016587 Cf. A002162 (log(2)), A016644 (log(21)).
%K A016587 nonn,cons
%O A016587 1,1
%A A016587 _N. J. A. Sloane_