OFFSET
1,2
REFERENCES
Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, page 251.
LINKS
Eric Weisstein's MathWorld, Lebesgue constants
FORMULA
(1/Pi)*integral_{t=0..Pi} abs(sin(5*t/2))/sin(t/2)
Equals 1/5 + sqrt(25 - 2*sqrt(5))/Pi.
EXAMPLE
1.6421884352221211368736279889229403441838234554848874300776204207704665695525...
MATHEMATICA
RealDigits[1/5 + Sqrt[25 - 2*Sqrt[5]]/Pi, 10, 100][[1]]
CROSSREFS
KEYWORD
cons,nonn
AUTHOR
Jean-François Alcover, Jun 14 2013
STATUS
approved