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-   -   New mersenne factor found, what to do with it? (https://www.mersenneforum.org/showthread.php?t=26820)

mersenneNoob 2021-05-23 08:22

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.

mersenneNoob 2021-05-23 09:00

Do I send an email or what?

axn 2021-05-23 11:05

You can try submitting it via [url]https://www.mersenne.ca/bulk-factors.php[/url]

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.

mersenneNoob 2021-05-23 23:31

thanks, axn!

James Heinrich 2021-05-24 00:11

[QUOTE=axn;578905]You can try submitting it via [url]https://www.mersenne.ca/bulk-factors.php[/url][/QUOTE]That would be the correct way to submit results. Since mfaktx doesn't go above 2[sup]32[/sup] exponents the result file should only include factor lines in this format:[code]UID: mersenneNoob/myComputerName, M9999971879 has a factor: 17120076576497274889[/code]The "UID" section is required, and nofactor results in the >4G range are not accepted.

mersenneNoob 2021-05-24 00:24

[QUOTE=James Heinrich;578959] Since mfaktx doesn't go above 2[sup]32[/sup] exponents the result file should only include factor lines in this format:[/QUOTE]

But I used factor5 not mfaktc. Anyway I already submitted it using the line you provided. :)

kriesel 2021-05-30 15:05

[QUOTE=mersenneNoob;578961]But I used factor5 not mfaktc.[/QUOTE]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 2[SUP]32[/SUP] of mfaktx, there's Ernst's [URL="https://www.mersenneforum.org/showthread.php?t=26246"]Mfactor[/URL] program, several times the speed of factor5.

Please [URL="https://mersenneforum.org/showthread.php?t=24607"]educate yourself[/URL] on the available resources and run time scaling.

ET_ 2021-05-31 10:49

[QUOTE=kriesel;579492]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 2[SUP]32[/SUP] of mfaktx, there's Ernst's [URL="https://www.mersenneforum.org/showthread.php?t=26246"]Mfactor[/URL] program, several times the speed of factor5.

Please [URL="https://mersenneforum.org/showthread.php?t=24607"]educate yourself[/URL] on the available resources and run time scaling.[/QUOTE]

Is there a version of Mfactor for 64-bit ARM CPUs (like Raspberry)?

kriesel 2021-05-31 13:01

[QUOTE=ET_;579543]Is there a version of Mfactor for 64-bit ARM CPUs (like Raspberry)?[/QUOTE]
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

birtwistlecaleb 2021-06-30 21:46

Good job! You can say that you can multiply 17120076576497274889 enough times to get M9999971879!

James Heinrich 2021-06-30 21:51

[QUOTE=birtwistlecaleb;582368]Good job! You can now say that you proved that [url=https://www.mersenne.ca/exponent/9999971879]M9999971879[/url] is composite![/QUOTE]Not really, 5 other smaller factors were known for 3 years before this latest factor.


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