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Old 2021-05-23, 08:22   #1
mersenneNoob
 
"Nigel"
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Default New mersenne factor found, what to do with it?

I found a new mersenne factor:
17120076576497274889 divides M9999971879
I found it using factor5. How do I send it to the Mersenne.ca server?
If I did not do any miscalculations this is the 6th factor of M9999971879.

Last fiddled with by mersenneNoob on 2021-05-23 at 08:35
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Old 2021-05-23, 09:00   #2
mersenneNoob
 
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Do I send an email or what?

Last fiddled with by mersenneNoob on 2021-05-23 at 09:18
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Old 2021-05-23, 11:05   #3
axn
 
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You can try submitting it via https://www.mersenne.ca/bulk-factors.php

But it looks like it is set to accept mfaktc result format.

I'll move this thread to mersenne.ca subforum. Maybe James will see it.
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Old 2021-05-23, 23:31   #4
mersenneNoob
 
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thanks, axn!
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Old 2021-05-24, 00:11   #5
James Heinrich
 
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Quote:
Originally Posted by axn View Post
You can try submitting it via https://www.mersenne.ca/bulk-factors.php
That would be the correct way to submit results. Since mfaktx doesn't go above 232 exponents the result file should only include factor lines in this format:
Code:
UID: mersenneNoob/myComputerName, M9999971879 has a factor: 17120076576497274889
The "UID" section is required, and nofactor results in the >4G range are not accepted.
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Old 2021-05-24, 00:24   #6
mersenneNoob
 
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Quote:
Originally Posted by James Heinrich View Post
Since mfaktx doesn't go above 232 exponents the result file should only include factor lines in this format:
But I used factor5 not mfaktc. Anyway I already submitted it using the line you provided. :)
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Old 2021-05-30, 15:05   #7
kriesel
 
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Quote:
Originally Posted by mersenneNoob View Post
But I used factor5 not mfaktc.
Please help with GIMPS wavefront TF with a GPU, or supplement the 100Mdigit TF with a GPU. Trial factoring is not effective use of a CPU when there's a GPU alternative.
If you feel compelled to work above the range of mfaktx (centuries ahead of GIMPS TF need), there's the possibility of mmff for double mersennes on GPU. Or for mersennes above the 232 of mfaktx, there's Ernst's Mfactor program, several times the speed of factor5.

Please educate yourself on the available resources and run time scaling.

Last fiddled with by kriesel on 2021-05-30 at 15:06
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Old 2021-05-31, 10:49   #8
ET_
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Quote:
Originally Posted by kriesel View Post
Please help with GIMPS wavefront TF with a GPU, or supplement the 100Mdigit TF with a GPU. Trial factoring is not effective use of a CPU when there's a GPU alternative.
If you feel compelled to work above the range of mfaktx (centuries ahead of GIMPS TF need), there's the possibility of mmff for double mersennes on GPU. Or for mersennes above the 232 of mfaktx, there's Ernst's Mfactor program, several times the speed of factor5.

Please educate yourself on the available resources and run time scaling.
Is there a version of Mfactor for 64-bit ARM CPUs (like Raspberry)?
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Old 2021-05-31, 13:01   #9
kriesel
 
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Quote:
Originally Posted by ET_ View Post
Is there a version of Mfactor for 64-bit ARM CPUs (like Raspberry)?
No idea if it will compile for that. It seems possible, since Mlucas is. I imagine an answer could come from

1) inspecting the source code
2) attempting a compile
3) a reply by Ernst


A quick look into source module factor.c for "arm" finds

#if (TRYQ > MAX_TRYQ) && !defined(USE_ARM_V8_SIMD) // Ignore on ARMv8, since no TF support there anyway
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Old 2021-06-30, 21:46   #10
birtwistlecaleb
 
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Good job! You can say that you can multiply 17120076576497274889 enough times to get M9999971879!

Last fiddled with by birtwistlecaleb on 2021-06-30 at 22:01
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Old 2021-06-30, 21:51   #11
James Heinrich
 
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Quote:
Originally Posted by birtwistlecaleb View Post
Good job! You can now say that you proved that M9999971879 is composite!
Not really, 5 other smaller factors were known for 3 years before this latest factor.
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