OFFSET
2,1
COMMENTS
Usually reported as 22.7.
LINKS
V. N. Efimov, Weakly-bound states of three resonantly-interacting particles, Soviet Journal of Nuclear Physics 12:5 (1971), pp. 589-595. [Yad. Fiz. 12 (1970), 1080].
Wikipedia, Efimov state
MATHEMATICA
RealDigits[E^(Pi/x)/.FindRoot[x*Cosh[Pi*x/2] - 8*Sinh[Pi*x/6]/Sqrt[3], {x, 2}, WorkingPrecision->105]][[1]] (* Vaclav Kotesovec, May 28 2014 *)
PROG
(PARI) exp(Pi/solve(x=1, 2, x*cosh(Pi*x/2)-8*sinh(Pi*x/6)/sqrt(3)))
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Charles R Greathouse IV, May 28 2014
STATUS
approved