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A114609 Decimal expansion of Sum_{k=-infinity..+infinity} log(2)/(2^(-k/2) + 2^(k/2)). 1
3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 9, 5, 1, 8, 2, 3, 8, 3, 2, 8, 8, 4, 2, 3, 9, 5, 1, 3, 3, 7, 1, 9, 5, 7, 4, 6, 4, 7, 4, 3, 0, 2, 5, 6, 3, 7, 8, 1, 8, 2, 2, 2, 9, 2, 9, 0, 4, 4, 4, 3, 1, 7, 2, 5, 0, 9, 1, 3, 0, 3, 0, 4, 8, 2, 7, 0, 4, 2, 4, 1, 7, 6, 1, 0, 1, 2, 3, 7, 5, 1, 5, 3, 5, 6, 7, 5, 8, 5, 1, 1, 9 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Differs from Pi by 5.3*10^-12.

LINKS

Table of n, a(n) for n=0..101.

Eric Weisstein's World of Mathematics, Almost Integer

EXAMPLE

3.14159265359518238328842...

MATHEMATICA

almostPi = Log[2]/2 + 2*Log[2]*NSum[1/(2^(-k/2) + 2^(k/2)), {k, 1, Infinity}, WorkingPrecision -> 110, NSumTerms -> 100]; RealDigits[almostPi, 10, 102] // First (* Jean-Fran├žois Alcover, Feb 07 2013 *)

CROSSREFS

Sequence in context: A112602 A000796 A212131 * A271452 A068089 A068079

Adjacent sequences:  A114606 A114607 A114608 * A114610 A114611 A114612

KEYWORD

nonn,cons

AUTHOR

Eric W. Weisstein, Dec 15 2005

STATUS

approved

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Last modified August 4 05:13 EDT 2020. Contains 336201 sequences. (Running on oeis4.)