Coming up with an efficient, pure perl implementation of prime factorisation (limiting myself to integers 0 .. 2**32 ) is my current fun challenge :)
You might have a look at Math::Big::Factors, which I found useful, and is pure Perl. (Note that the docs have a typo, and mention factor_wheel where the function is actually named factors_wheel.)

-QM
--
Quantum Mechanics: The dreams stuff is made of

In reply to Re^3: Algorithm for cancelling common factors between two lists of multiplicands by QM
in thread Algorithm for cancelling common factors between two lists of multiplicands by BrowserUk

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