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Old 2005-09-03, 13:13   #1
Kosmaj
 
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Nov 2003

2×1,811 Posts
Default 65*2^n-1

Templus has been testing k=65 for a while. He completed the 210-420k range but found no primes. So he got a bit tired and he suggested that we try a distributed approach on remaining values. He sieved to 600 bn. So here are the files. In comparison to 15k candidates there are not so many values per file and tests are faster because of small k, so I divided them in 5k chunks.

For details on how to set up LLR, and what to do if you find a prime please consult the 2995125705 thread.

To new users reserving presieved ranges: Please briefly introduce yourself upon your first reservation providing references on prime search and/or other distributed projects. Thank you!

Found primes
65*2^578512-1 (174152 digits) by Pconfig on Sep 18, 2005
65*2^647130-1 (194808 digits) by Battlemaxx on Aug 2, 2006

Status
Code:
     Range          Tested by
210,000 - 430,000 - Templus      - Complete
430,000 - 600,000 - 15k          - Complete (1 prime)
600,000 - 720,000 - RPS          - Complete (1 prime)
720,000 - 740,000 - Thomas       - Complete
740,000 - 750,000 - John         - Complete
750,000 - 800,000 - Thomas       - Complete
800,000 - 810,000 - Battlemaxx   - Complete
810,000 - 830,000 - Thomas       - Complete
830,000 - 840,000 - Battlemaxx   - Complete
840,000 - 900,000 - Thomas       - Complete
900,000 - 910,000 - Battlemaxx   - Complete
910,000 - 990,000 - Thomas       - Complete
All ranges taken. For the time being this subproject is closed.
Last tested n=989596.

Test files were sieved through 2835 bn (2.83E12).

Last fiddled with by Kosmaj on 2007-03-07 at 22:39
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Old 2005-09-03, 15:34   #2
Pconfig
 
Jun 2004

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Reserving 440 to 445
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Old 2005-09-03, 16:37   #3
OmbooHankvald
 
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May 2005
Copenhagen, Denmark

172 Posts
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First-time searcher reserving 445-450

About me: I've only recently appeared in the world of Distributed Computing, but I find it a fun approach to solve problems and find primes.
Unfortunately I haven't found any primes yet since I've only got 2 PC's which jumps from one project to another.

However, I have written guides to help newbies get started.

Regards
OmbooHankvald

BTW, my real name is not Omboo Hankvald
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Old 2005-09-04, 00:11   #4
Dougy
 
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Aug 2004
Melbourne, Australia

23·19 Posts
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450to455.txt => mine please
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Old 2005-09-04, 12:51   #5
Pconfig
 
Jun 2004

678 Posts
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440 to 445 complete (0 primes)

Reserving 455 to 460
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Old 2005-09-05, 05:56   #6
Dougy
 
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Aug 2004
Melbourne, Australia

9816 Posts
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450to455.txt complete, no primes.
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Old 2005-09-05, 21:04   #7
Pconfig
 
Jun 2004

5·11 Posts
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455 to 460 complete (0 primes found)

Reserving: 460 to 465
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Old 2005-09-06, 19:36   #8
Templus
 
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Jun 2004

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420000 to 430000 completed, no primes found.

I wish everybody on this k good luck. I'll be switching to some other k's myself.
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Old 2005-09-07, 10:58   #9
Pconfig
 
Jun 2004

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Complete 460 to 465 (0 primes)

Reserving 465 to 470

This seems to be a real low prime K, is it worth continuing on it?

Last fiddled with by Pconfig on 2005-09-07 at 11:00
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Old 2005-09-08, 05:19   #10
Pconfig
 
Jun 2004

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Reserving: 470 to 475
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Old 2005-09-08, 14:56   #11
OmbooHankvald
 
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May 2005
Copenhagen, Denmark

28910 Posts
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445-450 completed (no primes)
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