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Old 2007-04-20, 08:31   #2
akruppa
 
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"Nancy"
Aug 2002
Alexandria

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It depends on the parameters. Bad sigma values can cause the trivial factor N to be found, specifically sigma=0,1,2,3 and 5, afaik. Also, if all prime factors in N are relatively small and your B1 value is high enough, ECM can find all factors simultaneously and hence return N as the factor.

Alex
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