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 A016646 #20 Jul 22 2025 07:03:17
%S A016646 3,1,3,5,4,9,4,2,1,5,9,2,9,1,4,9,6,9,0,8,0,6,7,5,2,8,3,1,8,1,0,1,9,6,
%T A016646 1,1,8,4,4,2,3,8,0,3,1,4,8,4,0,4,3,5,7,4,1,9,9,8,6,3,5,3,7,7,4,8,2,9,
%U A016646 9,3,2,4,5,9,8,4,7,9,8,2,9,8,1,9,8,4,0,1,0,9,2,1,5,2,9,9,4,8,1
%N A016646 Decimal expansion of log(23).
%D A016646 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 A016646 Harry J. Smith, <a href="/A016646/b016646.txt">Table of n, a(n) for n = 1..20000</a>
%H A016646 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 A016646 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%F A016646 2*log(23) = 9*log(2)+ sum_{k >=1} (-1)^(k+1)/k*(17/512)^k. - _R. J. Mathar_, Jul 22 2025
%e A016646 3.135494215929149690806752831810196118442380314840435741998635377482993....
%t A016646 RealDigits[Log[23], 10, 100][[1]] (* _Alonso del Arte_, Feb 23 2015 *)
%o A016646 (PARI) default(realprecision, 20080); x=log(23); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b016646.txt", n, " ", d)); \\ _Harry J. Smith_, May 17 2009, corrected May 20 2009
%Y A016646 Cf. A016451 (continued fraction). - _Harry J. Smith_, May 17 2009
%K A016646 nonn,cons
%O A016646 1,1
%A A016646 _N. J. A. Sloane_