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Old 2003-09-15, 10:03   #6
Feb 2003

2568 Posts

GP2 -

for the following numbers:

 8276539 103  DF  7411192628700266363789140779170  18-Nov-02 00:48  Team_Prime_Rib Tasuke18
17699497 103   F  8254656556609760068242738155742  26-Mar-03 08:12  Team_Prime_Rib KL_MLChan
18129493 103   F  8754500160125057908417949485956  24-Feb-03 07:26  curtisc        wde3100-09
Since the bit length of these numbers is significantly above the upper limit for trial factoring, these must have been found by the P-1 factoring step. P-1 factoring can find composite factors of M numbers, and when this happens, the server factors the reported factor and saves only the smallest prime factor of the reported number, i.e. the smallest known prime factor of the M number.

This is probably what happened here.

On a side note, the reported factors are 66, 66, and 69 bits, respectively. This means the server has an upper limit on the number of bits it reports.

Last fiddled with by apocalypse on 2003-09-15 at 10:04
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