Current CVS (2006/04/27) has 2*3*2^k becoming 6*2^k.
Should this be 3*2^(k+1)? It would be nice, but....
What about a*b^k where a is a large number? Do we want
to check if a contains any powers of b so we can return
a new result of the form (a/b^k)*b^(k+1)?
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