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Old 2019-04-14, 10:46   #1398
GP2
 
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Quote:
Originally Posted by lycorn View Post
Yes, I agree. But my point has to do with the way the factors were reported.
He is probably using GMP-ECM for stage 2. That would be the logical thing to do for such small exponents. And in that case there would be no automatic reporting to Primenet.

Quote:
This reminds that when a factor was eventually found for M1061, a couple of years ago, F-ECM showed up in the report, although other method had been used. I think it was SNFS.
But for M1061 it was split into two primes of 143 digits and 177 digits. With NFS you usually get enormous factors and the exponent ends up fully factored, and it's usually only feasible for the Cunningham ranges, in the low 1K exponent values. These factors and these exponents from Ryan Propper don't match that at all. They are much more typical of deep ECM.

Last fiddled with by GP2 on 2019-04-14 at 10:55
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Old 2019-04-14, 11:15   #1399
newalex
 
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Maybe he uses GMP-ECM and doesn't want to email results without factors? And uses a lot of computing power to compete 55-60 digits range for one exponent in few days.



I believe the problem with curves and bounds is the problem of version 29.6 which I am using. Perhaps it submits results in JSON format which is not parsed correctly by server. Text results in results.txt look identical to previous versions.


By the way I found another 40+ digits factor with 30 digits bounds. I am curious what is probability of such discovery?

[Sun Apr 14 07:19:46 2019]
ECM found a factor in curve #147, stage #2
Sigma=7835381084152872, B1=250000, B2=25000000.
M389749 has a factor: 35157083141838820140048845608443589051481 (ECM curve 147, B1=250000, B2=25000000)
134.69 bits
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Old 2019-04-14, 13:36   #1400
lycorn
 
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Quote:
Originally Posted by GP2 View Post
He is probably using GMP-ECM for stage 2. That would be the logical thing to do for such small exponents. And in that case there would be no automatic reporting to Primenet.
That makes sense. It was probably the case. It is just a pity the whole amount of curves done wasn"t reported.
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Old 2019-04-14, 21:02   #1401
Thecmaster
 
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woooohooooooo First P-1 factor

Factor: 73683712459653894665954956209427783 / (P-1, B1=695000, B2=13205000, E=12)
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Old 2019-04-14, 22:06   #1402
petrw1
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Default 2477 makes 4 for Ryan

Beyond good luck...
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Old 2019-04-14, 22:53   #1403
lycorn
 
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Indeed. The default value (2500) for the ecm progress table will soon have to be raised or the table will display no values at all...
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Old 2019-04-15, 04:32   #1404
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Default M2377 just had a factor found

This was the 6th smallest M without a factor!
https://www.mersenne.org/report_ecm/
https://www.mersenne.ca/exponent/2377

187 bits! and impossible to find with P-1 go ECM
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Old 2019-04-17, 15:16   #1405
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P-1 found a factor in stage #1, B1=695000.
UID: Jwb52z/Clay, M91216309 has a factor: 646532530928667932245369 (P-1, B1=695000)

79.097 bits
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Old 2019-04-17, 15:43   #1406
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Quote:
Originally Posted by SethTro View Post
This was the 6th smallest M without a factor!
https://www.mersenne.org/report_ecm/
https://www.mersenne.ca/exponent/2377

187 bits! and impossible to find with P-1 go ECM
Already reported just 10 posts before yours.
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Old 2019-04-19, 13:39   #1407
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P-1 found a factor in stage #1, B1=695000.
UID: Jwb52z/Clay, M91221769 has a factor: 4115254730949418739220409 (P-1, B1=695000)

81.767 bits
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Old 2019-04-20, 18:40   #1408
Thecmaster
 
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90901697 F-PM1 2019-04-20 17:20 0.0 Factor: 462195198223850274269081 / (P-1, B1=695000)

Where and how can you check bitlevel on a factor?
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