OFFSET
1,1
LINKS
Eric Weisstein's MathWorld, Gamma Function
Wikipedia, Particular values of the Gamma Function
FORMULA
Solution to PolyGamma(x) = 0 in the interval [-8,-7].
EXAMPLE
Gamma(-7.6877883250316260374400988918437049536838217978826433594...)
= 0.0001818784449094041881014174426244626530404358160668...
MATHEMATICA
digits = 106; x0 = x /. FindRoot[PolyGamma[0, x] == 0, {x, -15/2}, WorkingPrecision -> digits + 5]; RealDigits[x0, 10, digits] // First
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Jean-François Alcover, Apr 08 2015
STATUS
approved