Numerical Evaluation: hypergeometric or assoc_legendre_p



Is there a way to numerically evaluate the assoc_legendre_p function, or 
the hypergeometric function. For example, the wolfram web site

http://mathworld.wolfram.com/HypergeometricFunction.html

gives:

_2 F_1 (1/3, 2/3, 5/6, 27/32) = 8/5,

while maxima

hgfred([1/3, 2/3],[5/6],27/32) results in:

 ( 3^(1/4)*assoc_legendre_p(-2/3, 1/6, -11/16)*gamma(5/6) ) / 5^(1/12).

Thank you,

John