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 [-7,-6]
EXAMPLE
Gamma(-6.6784182130734267428298558886022000992046860101507601433975...)
= -0.0013973966089497673013074886687985785170487809897563228...
MATHEMATICA
digits = 104; x0 = x /. FindRoot[PolyGamma[0, x] == 0, {x, -13/2}, WorkingPrecision -> digits + 5]; RealDigits[x0, 10, digits] // First
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Jean-François Alcover, Apr 08 2015
STATUS
approved