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%I #5 Jun 03 2014 08:50:58
%S 2,6,8,8,9,5,6,6,0,1,6,9,3,1,1,2,2,5,4,6,9,2,9,4,8,6,7,2,2,7,2,4,5,6,
%T 6,4,5,2,4,9,9,4,4,3,7,1,9,3,0,3,1,3,7,2,9,2,1,0,7,6,4,8,0,2,5,7,6,3,
%U 9,2,6,0,9,0,0,9,9,2,6,4,7,2,9,4,4,3,7,4,8,1,3,4,8,4,3,1,8,1,9,7,5,3
%N Decimal expansion of the volume of a regular ideal hyperbolic 4-simplex.
%D Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 8.9 Hyperbolic volume constants, p. 512.
%F 10*Pi/3*arcsin(1/3) - Pi^2/3.
%e 0.268895660169311225469294867227245664524994437...
%t RealDigits[10*Pi/3*ArcSin[1/3] - Pi^2/3, 10, 102] // First
%Y Cf. A019503, A143298 (Gieseking's constant is also the volume of a regular ideal hyperbolic 3-simplex).
%K nonn,cons,easy
%O 0,1
%A _Jean-François Alcover_, Jun 03 2014
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