I don't think you should have provided an answer, especially one without an explanation. Remember this is a homework problem. We are supposed to be helping the supplicant to reach a solution by giving hints, and insightful analysis of the problem.
For example kennethk pointed out that that there is no need to store prime factors if they will be printed out.
By giving an answer, you did not help the supplicant, you where just showing off.
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