Comment #2 on issue 2003 by asmeurer: Use factorint() with limit argument in sympy/core/numbers.py
http://code.google.com/p/sympy/issues/detail?id=2003
Actually, it already uses a function called integer_nthroot() ._eval_power() to do this. We just need to make sure to do this on any remaining factors returned by factorint() (but then again, I think we can be more efficient by adding some code to factorint() that prevents us from doing this when we don't need to, i.e., when the factors are known to be prime, or the root is coprime with the one we are evaluating in ._eval_power()).
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