Comment #4 on issue 3565 by [email protected]: Sum(x**n, (n, 0, oo)).doit() is wrong
http://code.google.com/p/sympy/issues/detail?id=3565
It seems that it no longer sees that summation(2**n, (n, 1, oo)) is oo if you do this. The fix I guess would be to add a new check if the base is numeric and greater than 1, then the series is oo.
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