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 A145961 Decimal expansion of 2*log(3) - 4*arccot(2) used in BBP Pi formula. 4
 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, 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, 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 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS BBP formula for Pi = 4*A145963 - (1/2)*A145960 - (1/2)*A145961 - A145962. LINKS Eric Weisstein's World of Mathematics, BBP Formula. FORMULA Equals 2*log(3) - 4*arccot(2). Equals (1/3)*Hypergeometric2F1(1, 3/4, 7/4, 1/16). Equals Sum_{k>=0} (1/16)^k/(4*k+3). EXAMPLE 0.342634141332994917933465548000193801180832898501017848225656312394197... MATHEMATICA First[RealDigits[2Log[3] - 4ArcCot[2], 10, 100]] PROG (PARI) 2*log(3) - 4*atan(1/2) \\ Michel Marcus, Jan 16 2021 CROSSREFS Cf. A000796, A145960, A145962, A145963. Sequence in context: A133620 A322965 A154570 * A082928 A139524 A247413 Adjacent sequences: A145958 A145959 A145960 * A145962 A145963 A145964 KEYWORD cons,nonn AUTHOR Artur Jasinski, Oct 25 2008 EXTENSIONS Leading zero removed, offset adjusted by R. J. Mathar, Feb 05 2009 STATUS approved

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Last modified March 20 18:09 EDT 2023. Contains 361391 sequences. (Running on oeis4.)