OFFSET
0,1
REFERENCES
Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 8.9 Hyperbolic volume constants, p. 512.
FORMULA
10*Pi/3*arcsin(1/3) - Pi^2/3.
EXAMPLE
0.268895660169311225469294867227245664524994437...
MATHEMATICA
RealDigits[10*Pi/3*ArcSin[1/3] - Pi^2/3, 10, 102] // First
CROSSREFS
KEYWORD
AUTHOR
Jean-François Alcover, Jun 03 2014
STATUS
approved