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 [-10,-9].
EXAMPLE
Gamma(-9.7026725400018637360844267648942153185775505998219124864...)
= 0.00000215741610452285054050313702063056774903546226316...
MATHEMATICA
digits = 103; x0 = x /. FindRoot[PolyGamma[0, x] == 0, {x, -19/2}, WorkingPrecision -> digits + 5]; RealDigits[x0, 10, digits] // First
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Jean-François Alcover, Apr 08 2015
STATUS
approved