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 A289504 #23 Dec 13 2024 10:13:04
%S A289504 3,6,5,3,9,8,6,6,8,6,2,6,5,3,7,6,1,4,8,5,3,3,9,7,9,4,9,4,9,3,8,9,0,8,
%T A289504 3,2,4,1,9,2,1,5,9,4,4,1,0,9,9,9,2,1,9,5,8,3,9,8,0,9,8,0,6,0,8,7,3,0,
%U A289504 9,0,9,1,0,4,0,7,8,0,9,3,8,4,5,2,1,1
%N A289504 Decimal expansion of 2*(1+3^(3/2)/(2*Pi)).
%H A289504 Steven R. Finch, <a href="http://arxiv.org/abs/1111.4976">Mean width of a regular simplex</a>, arxiv:1111.4976 [math.MG], (2016), nu_2.
%H A289504 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%F A289504 Equals 2*(1+A086089).
%e A289504 3.6539866862653761485339794949389083241921...
%p A289504 2*(1+3*sqrt(3)/2/Pi); evalf(%) ;
%t A289504 RealDigits[2(1+3^(3/2)/(2Pi)),10,120][[1]] (* _Harvey P. Dale_, Nov 05 2019 *)
%o A289504 (Python)
%o A289504 from mpmath import *
%o A289504 mp.dps=86
%o A289504 C=2*(1 + 3*sqrt(3)/(2*pi))
%o A289504 print([int(n) for n in list(str(C).replace('.', ''))]) # _Indranil Ghosh_, Jul 08 2017
%o A289504 (PARI) 2+3*sqrt(3)/Pi \\ _Charles R Greathouse IV_, Oct 01 2022
%K A289504 nonn,cons,easy
%O A289504 1,1
%A A289504 _R. J. Mathar_, Jul 07 2017