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Old 2022-06-06, 21:40   #34
kriesel
 
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"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest

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Selecting M199 for a test run that would require stage 2 in P-1; 10 separate 1-curve B1=50000, B2=4000000 runs, succeeded in 7 of 10:
Code:
ECM found a factor in curve #1, stage #1
Sigma=5162481759413312, M199 has a factor: 164504919713 
Cofactor is a probable prime!

ECM found a factor in curve #1, stage #1
Sigma=5912327664438779, M199 has a factor: 164504919713 
Cofactor is a probable prime!

M199 completed 1 ECM curve

ECM found a factor in curve #1, stage #2
Sigma=7974985130155996, M199 has a factor: 164504919713 

ECM found a factor in curve #1, stage #2
Sigma=8865572054271244, M199 has a factor: 164504919713 

ECM found a factor in curve #1, stage #1
Sigma=608224716041860, M199 has a factor: 164504919713 
Cofactor is a probable prime!

ECM found a factor in curve #1, stage #2
Sigma=1498813620767224, M199 has a factor: 164504919713 

M199 completed 1 ECM curve

M199 completed 1 ECM curve

ECM found a factor in curve #1, stage #2
Sigma=4311317535291977, M199 has a factor: 164504919713
(This factor is only 37 bits so would have been found in the recommended 40-44 bits TF.)

Or M257, B1=120000, B2=4000000, 10 separate curves run individually, of which two found the 49 bit factor that would not be found by recommended level TF (to 40-44 bits):
Code:
ECM found a factor in curve #1, stage #2
Sigma=5976369241598935, M257 has a factor: 535006138814359 

M257 completed 1 ECM curve

ECM found a factor in curve #1, stage #2
Sigma=8788874036099382, M257 has a factor: 535006138814359
M257 completed 1 ECM curve
M257 completed 1 ECM curve
M257 completed 1 ECM curve
M257 completed 1 ECM curve
M257 completed 1 ECM curve
M257 completed 1 ECM curve
M257 completed 1 ECM curve

Last fiddled with by kriesel on 2022-06-06 at 21:41
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