Forum: FermatSearch
2022-03-22, 02:57
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Replies: 37
Views: 18,809
I tested your list of PRPs (184211 unique...
I tested your list of PRPs (184211 unique numbers) and verified that none of them is a GFN divisor. This was a bit surprising since my estimate for this particular range was 2.5 GFN factors. Looks...
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Forum: Hardware
2022-01-09, 15:39
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Replies: 25
Views: 1,638
Another used Xeon option you might consider is...
Another used Xeon option you might consider is refurbished Dell and HP workstations. One that I like is here (https://pcserverandparts.com/HP-Z440-Workstation/) where you can custom configure a Z440...
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Forum: FermatSearch
2021-11-30, 04:30
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Replies: 345
Views: 92,357
The program is called “gfs” for GPU Fermat...
The program is called “gfs” for GPU Fermat Search. It is a “Sieve + Trial Division” program that supports integers (trial divisors) up to 2046 bits and can search for factors of either Fermat numbers...
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Forum: FermatSearch
2021-08-12, 13:29
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Replies: 345
Views: 92,357
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Forum: FermatSearch
2021-03-15, 02:38
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Replies: 35
Views: 15,629
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Forum: FermatSearch
2021-03-02, 04:19
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Replies: 345
Views: 92,357
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Forum: FermatSearch
2021-02-20, 03:01
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Replies: 12
Views: 10,804
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Forum: FermatSearch
2021-02-10, 13:46
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Replies: 12
Views: 10,804
Proth prime GFN divisibilities
Here are a couple of GFN divisibilities for a new large Proth prime reported on PrimesPages. Reporting here because I don't have the ability to post user comments on PrimesPages, likely because I...
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Forum: FermatSearch
2021-01-05, 14:34
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Replies: 3
Views: 2,060
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Forum: FermatSearch
2021-01-05, 04:21
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Replies: 35
Views: 15,629
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Forum: FermatSearch
2021-01-03, 18:14
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Replies: 35
Views: 15,629
Most ProthSearch ranges are like FermatSearch...
Most ProthSearch ranges are like FermatSearch ranges: a range of N * a range of K. There is a good summary table at http://www.prothsearch.com/GFNsrch.txt. I would call the search ranges of the two...
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Forum: FermatSearch
2021-01-03, 04:52
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Replies: 35
Views: 15,629
Luigi recently posted a request that search...
Luigi recently posted a request that search ranges which could discover GFN factors be of the form n = xxx0 - xxx0:
https://www.mersenneforum.org/showpost.php?p=566369&postcount=9
This would...
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Forum: FermatSearch
2021-01-02, 05:49
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Replies: 345
Views: 92,357
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Forum: FermatSearch
2020-11-07, 18:58
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Replies: 32
Views: 5,129
Phil and I each discovered the F36 factor...
Phil and I each discovered the F36 factor independently, and then collaborated on the Math Comp paper. I used a Motorola MC6800 processor based system where the hardware, OS, assembler and Fermat...
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Forum: FermatSearch
2020-11-06, 05:32
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Replies: 32
Views: 5,129
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Forum: FermatSearch
2020-11-06, 03:57
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Replies: 32
Views: 5,129
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Forum: FermatSearch
2020-10-12, 07:23
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Replies: 345
Views: 92,357
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Forum: FermatSearch
2020-10-11, 03:56
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Replies: 345
Views: 92,357
Wilfrid Keller is aware of the new factor and...
Wilfrid Keller is aware of the new factor and just updated his Fermat factors page. I expect he will update the GFN pages once the pfgw run completes. I am running it through pgfw also, as a double...
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Forum: FermatSearch
2020-10-05, 03:17
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Replies: 345
Views: 92,357
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Forum: Lounge
2020-08-19, 02:28
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Replies: 98
Views: 31,415
I received my two T-shirts today. The package...
I received my two T-shirts today. The package looks like it has traveled half way around the world (which it has!), but the shirts came through in good condition. And they look awesome! I really like...
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Forum: Software
2020-02-06, 04:06
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Replies: 5
Views: 3,513
Also, from looking at mprime source, I think...
Also, from looking at mprime source, I think NoMoreWork=1 has to be in the "global section" of the prime.txt file, before any section headers like [PrimeNet]. When I stuck it at the end of the...
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Forum: Software
2020-02-06, 02:17
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Replies: 46
Views: 16,768
Hi Simon. I agree with Curtis that your flat...
Hi Simon. I agree with Curtis that your flat performance vs # cores is likely a symptom of being memory bandwidth limited at that size of FFT. If you can afford it, I would recommend installing 8...
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Forum: Software
2020-02-01, 02:59
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Replies: 5
Views: 3,513
The whatsnew.txt file for 25.5 says " Several...
The whatsnew.txt file for 25.5 says " Several files have been renamed so that they are not changed by Windows save/restore. Prime.ini is now prime.txt. ..."
So should the NoMoreWork=1 line be...
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Forum: PrimeNet
2020-01-11, 22:27
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Replies: 8
Views: 5,262
Just wondering what the status is on creating a...
Just wondering what the status is on creating a benchmark page for all-cores results. It would be helpful to know what the best reported all-cores performance achieved by others is when setting up a...
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Forum: Operazione Doppi Mersennes
2019-12-09, 03:47
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Replies: 384
Views: 87,767
Looks like you are right! When running small...
Looks like you are right! When running small ranges, each time before an error occurs the number of factors surviving the sieve is zero (total_bit_count = 0 in the tf_*.h kernel). This causes the...
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