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 A289503 #28 Oct 13 2024 01:58:42
%S A289503 1,6,9,2,5,6,8,7,5,0,6,4,3,2,6,8,8,6,0,8,4,4,2,3,8,3,5,4,6,8,2,3,1,7,
%T A289503 7,5,7,5,3,2,1,5,1,8,8,7,9,8,6,9,9,6,5,7,0,5,3,2,2,5,7,1,6,5,1,3,1,9,
%U A289503 2,7,4,0,5,3,2,4,4,8,0,2,4,3,4,6,0,2,3,0
%N A289503 Decimal expansion of 3/sqrt(Pi).
%D A289503 R. K. Guy, Unsolved Problems in Number Theory, Springer, 1st edition, 1981. See section E10.
%H A289503 Steven R. Finch, <a href="http://arxiv.org/abs/1111.4976">Mean width of a regular simplex</a>, arxiv:1111.4976 [math.MG], (2016), mu_3.
%H A289503 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%F A289503 Equals 3*A087197.
%e A289503 1.6925687506432688608442383546823177...
%p A289503 3/sqrt(Pi); evalf(%) ;
%t A289503 First[RealDigits[3/Sqrt[Pi], 10, 100]] (* _Paolo Xausa_, Apr 29 2024 *)
%o A289503 (Python)
%o A289503 from mpmath import mp, sqrt, pi
%o A289503 mp.dps=90
%o A289503 print([int(z) for z in list(str(3/sqrt(pi)).replace('.', '')[:-2])]) # _Indranil Ghosh_, Jul 08 2017
%o A289503 (PARI) 3/sqrt(Pi) \\ _Charles R Greathouse IV_, Oct 01 2022
%Y A289503 Cf. A087197 (1/sqrt(Pi)).
%K A289503 nonn,cons,easy
%O A289503 1,2
%A A289503 _R. J. Mathar_, Jul 07 2017