OFFSET
1,2
LINKS
EXAMPLE
psi(2/3) = -1.3182344157865884724023408166...
MATHEMATICA
RealDigits[ -PolyGamma[2/3], 10, 98] // First (* Jean-François Alcover, Feb 20 2013 *)
PROG
(PARI) -psi(2/3) \\ Charles R Greathouse IV, Nov 22 2011
CROSSREFS
KEYWORD
cons,nonn
AUTHOR
R. J. Mathar, Nov 13 2011
STATUS
approved