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 A145961 #26 Feb 16 2025 08:33:09
%S A145961 3,4,2,6,3,4,1,4,1,3,3,2,9,9,4,9,1,7,9,3,3,4,6,5,5,4,8,0,0,0,1,9,3,8,
%T A145961 0,1,1,8,0,8,3,2,8,9,8,5,0,1,0,1,7,8,4,8,2,2,5,6,5,6,3,1,2,3,9,4,1,9,
%U A145961 7,1,2,9,7,7,4,2,5,1,1,1,2,5,4,4,8,3,0,3,7,3,6,8,7,9,1,2,6,0,7,3
%N A145961 Decimal expansion of 2*log(3) - 4*arccot(2) used in BBP Pi formula.
%C A145961 BBP formula for Pi = 4*A145963 - (1/2)*A145960 - (1/2)*A145961 - A145962.
%H A145961 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BBPFormula.html">BBP Formula</a>.
%F A145961 Equals 2*log(3) - 4*arccot(2).
%F A145961 Equals (1/3)*Hypergeometric2F1(1, 3/4, 7/4, 1/16).
%F A145961 Equals Sum_{k>=0} (1/16)^k/(4*k+3).
%e A145961 0.342634141332994917933465548000193801180832898501017848225656312394197...
%t A145961 First[RealDigits[2Log[3] - 4ArcCot[2], 10, 100]]
%o A145961 (PARI) 2*log(3) - 4*atan(1/2) \\ _Michel Marcus_, Jan 16 2021
%Y A145961 Cf. A000796, A145960, A145962, A145963.
%K A145961 cons,nonn
%O A145961 0,1
%A A145961 _Artur Jasinski_, Oct 25 2008
%E A145961 Leading zero removed, offset adjusted by _R. J. Mathar_, Feb 05 2009