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Old 2018-08-10, 16:30   #1
MisterBitcoin
 
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Default Factors found before ECM starts

Sometimes YAFU finds factors before it does any curve, like this example below.
How did YAFU manage to find this factor?

Code:
08/10/18 18:21:51 v1.34.5 @ SYDEKUM-PC, scheduled 214 curves at B1=50000 toward target pretesting depth of 36.31
08/10/18 18:22:24 v1.34.5 @ SYDEKUM-PC, Finished 214 curves using Lenstra ECM method on C118 input, B1=50K, B2=gmp-ecm default
08/10/18 18:22:24 v1.34.5 @ SYDEKUM-PC, pm1: starting B1 = 3750K, B2 = gmp-ecm default on C118
08/10/18 18:22:25 v1.34.5 @ SYDEKUM-PC, prp36 = 127944724266223981297293360194925961
08/10/18 18:22:25 v1.34.5 @ SYDEKUM-PC, current ECM pretesting depth: 25.33
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Old 2018-08-10, 16:58   #2
CRGreathouse
 
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I assume it was found on p-1.
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