Here's the question you clicked on:
jose206
which is the value of the gamma function in 1/3?
You want to know the value of this? \[ \Gamma(1/3) = \int_0^\infty t^{-2/3}e^{-t} \ dt \]
Well, it can't be calculated exactly but here's an approximation of it: http://www.wolframalpha.com/input/?i=gamma%281%2F3%29