Comment #4 on issue 1893 by mattpap: integrate(log(x) * x**(k-1) * exp(-x) / gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893

Things like x**k can't be handled by heuristic Risch algorithm, I'm sure that also by the recursive version. This is a case where integration method via Meijer-G functions comes handy (please notice the difference between algebraic and symbolic methods).

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