Comment #2 on issue 3998 by ness...@googlemail.com: summation(x**n/n, (n,
1, 400)) hangs
http://code.google.com/p/sympy/issues/detail?id=3998
Well the issue boils down to the fact that eval_sum, in line 545, "just
does the sumamtion" if there are less than a hundred terms. This is why it
seems to work with 400 replaced by 40 (say). However, the hyperexpand way
of doing it is hardly even viable for 10. I'm not really sure what to do
here. Maybe we should just disable the hypergeometric method for "direct"
sums - I don't think it is ever faster than doing the summation directly.
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