OFFSET
0,1
COMMENTS
Differs from Pi by 5.3*10^-12.
LINKS
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-François Alcover, Feb 07 2013 *)
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Eric W. Weisstein, Dec 15 2005
STATUS
approved