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 A242978 Decimal expansion of Efimov's scaling constant. 0
 2, 2, 6, 9, 4, 3, 8, 2, 5, 9, 5, 3, 6, 6, 6, 9, 5, 1, 9, 2, 8, 6, 0, 2, 1, 7, 1, 3, 6, 9, 3, 3, 3, 7, 6, 5, 1, 0, 2, 9, 8, 9, 6, 8, 9, 0, 1, 3, 0, 3, 1, 9, 1, 3, 6, 4, 8, 2, 6, 0, 8, 9, 4, 1, 6, 4, 2, 7, 1, 7, 1, 2, 9, 5, 6, 9, 8, 3, 0, 4, 2, 9, 0, 4, 9, 2, 5 (list; constant; graph; refs; listen; history; text; internal format)
 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 Sequence in context: A277510 A169800 A094485 * A231137 A188808 A021819 Adjacent sequences:  A242975 A242976 A242977 * A242979 A242980 A242981 KEYWORD nonn,cons AUTHOR Charles R Greathouse IV, May 28 2014 STATUS approved

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Last modified December 18 08:16 EST 2018. Contains 318219 sequences. (Running on oeis4.)