The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A145960 Decimal expansion of 2*log(5/3) used in BBP Pi formula. 4
 1, 0, 2, 1, 6, 5, 1, 2, 4, 7, 5, 3, 1, 9, 8, 1, 3, 6, 6, 4, 1, 1, 0, 2, 8, 1, 9, 2, 6, 0, 7, 3, 2, 3, 8, 6, 9, 7, 5, 6, 2, 2, 1, 5, 9, 2, 8, 9, 1, 5, 3, 6, 5, 4, 0, 3, 5, 5, 9, 0, 7, 1, 1, 5, 6, 7, 3, 3, 6, 9, 3, 8, 8, 9, 7, 8, 0, 9, 7, 5, 9, 5, 5, 1, 3, 0, 3, 6, 2, 4, 6, 5, 5, 8, 8, 9, 5, 0, 4, 4 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 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(5/3) = 2*(log(5)-log(3)) = 2*(A016628 - A002391) = log(25/9) = 4*arctanh(1/4). Equals Hypergeometric2F1(1, 1/2, 3/2, 1/16). Equals Sum_{k>=0} (1/16)^k*(1/(2k+1)). EXAMPLE 1.021651247531981366411... MATHEMATICA First[RealDigits[2 Log[5/3], 10, 100]] PROG (PARI) 2*log(5/3) \\ Michel Marcus, Apr 05 2015 CROSSREFS Cf. A000796, A145961, A145962, A145963. Sequence in context: A358282 A180317 A066654 * A205455 A338135 A350510 Adjacent sequences: A145957 A145958 A145959 * A145961 A145962 A145963 KEYWORD cons,nonn AUTHOR Artur Jasinski, Oct 25 2008 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified March 26 04:58 EDT 2023. Contains 361529 sequences. (Running on oeis4.)