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Message boards : Sieving : P-1 factoring Reservation

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John
Honorary cruncher

Joined: 21 Feb 06
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Message 7739 - Posted: 25 Nov 2007 | 14:42:49 UTC

P-1 factoring is suspended at them moment

As suggested, this thread will provide a candidate file for P-1 factoring. It is available for those who are interested in P-1 factoring for the Cullen/Woodall search.

This is a user driven effort; therefore everyone is encouraged to work together so as not to duplicate each others work. The B1 & B2 bounds have been pre-selected. If you wish to experiment, feel free to search and replace B1 and B2 bounds. Please posts your results if you discover different bounds that provide a more efficient search.

For P-1 factoring discussion, see here.

Submit factors to sieve at primegrid dot com.

Candidate file

None Available at this time

Basic instructions on participating:

2. Look through this thread to find the lastest reservation. Then look in the reservations and available candidates page (maintained by popandbob), select a range beyond that. Post your reservation in the thread. Sample reservation:

Reserving Pfactor=3850040-3850968

3. Copy your range from the reservations and available candidates page and paste it into the worktodo.ini file (located in your prime95 directory). Run prime95.

4. Results will be written to the results file. What to look for in the result file (sample output):

3750165*2^3750165-1 completed P-1, B1=500000, B2=6000000, E=12, Wd4: 6145BFBA
[Mon Nov 19 14:10:57 2007]
P-1 found a factor in stage #1, B1=500000.
3750180*2^3750180+1 has a factor: 1219276462562623
[Mon Nov 19 16:21:05 2007]

5. Email the highlighted line to sieve at primegrid dot com.
NOTE: In the above example, 3750165*2^3750165-1 completed with no factor.

____________

popandbob

Joined: 19 Aug 05
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Message 8372 - Posted: 7 Mar 2008 | 5:07:09 UTC

reserving 4998230 to 4999998
____________

popandbob

Joined: 19 Aug 05
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Message 8411 - Posted: 12 Mar 2008 | 3:40:28 UTC

P-1 found a factor in stage #2, B1=50000, B2=687500.
4998585*2^4998585-1 has a factor: 778493083948651
____________

John M. Johnson "Novex"
Volunteer tester

Joined: 16 Aug 07
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Message 8594 - Posted: 30 Mar 2008 | 23:48:50 UTC

The P-1 Factoring stats link above isn't working do you have a working link?

popandbob

Joined: 19 Aug 05
Posts: 109
ID: 463
Credit: 5,276,784
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Message 8604 - Posted: 31 Mar 2008 | 21:59:50 UTC - in response to Message 8594.

The P-1 Factoring stats link above isn't working do you have a working link?

I haven't logged into my geocities account for a while and unfortunately the page is lost (I just logged in and checked). There still is a stats page linked at the top of the reservations page for when we switched over to pfactor= (the original pminus1= was too slow and inefficient)

~BoB
____________

John M. Johnson "Novex"
Volunteer tester

Joined: 16 Aug 07
Posts: 625
ID: 10876
Credit: 1,066,951
RAC: 0

Message 8608 - Posted: 1 Apr 2008 | 5:07:50 UTC

Ah ok, Thanks a ton Bob /salute

Message boards : Sieving : P-1 factoring Reservation