20100201, 16:25  #1 
Feb 2010
Sweden
255_{8} Posts 
How I could assign a trial factorization Prime95?
Hello,
I would like to work on trial factorization of 2^10611 to extend it from the current state. So far it has been tried up to factors of 2^62. Could you please help me to assign a job for 2^622^63 and so far. 
20100201, 18:35  #2 
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
7×13×47 Posts 
Considering the ECM that has been done on it, TF from 2^62 to 2^63 is (nearly) guaranteed to be absolutely useless. This is the line you would add to worktodo.txt to have Prime95 TF it from 2^62 to 2^63, but it tells you to use ECM instead and doesn't let you do it:
Code:
Factor=1061,62,63 Last fiddled with by MiniGeek on 20100201 at 18:35 
20100201, 18:37  #3  
Bamboozled!
"๐บ๐๐ท๐ท๐ญ"
May 2003
Down not across
3^{2}·5·251 Posts 
Quote:
This number has had so much ECM work done on it that the chance of it having a factor of under 150 bits is somewhere between nil and negligible. You would be wasting your time and your electricity bill. If you don't understand that claim, or don't believe it, please Google "elliptic curve method". However, there are many other computations you could perform with a much, much greater probability of achieving a useful result. Quite a few people here could make suggestions, including myself. Paul P.S. Don't be dismayed by some of the reactions your proposal may elicit... Developing a thick skin is part of the entry requirements for playing an active part in online discussions. 

20100201, 22:01  #4 
Feb 2010
Sweden
173 Posts 
I agree that there is not much reason to check for lower factors, however if we want to be systematic, we should start from somewhere. The argument to continue what is done to 2^62 is that even a small chance that factor in that range exists, that should be checked and eventually eliminated as possibility. The problem is that the server does not recognize my assignment as Factor=1061,62,63 even not as Factor=1061,81,82. My attitude might be close to absolute stupidity, however why not to check systematically (step by step) for factors up to 250 bits if you wish . Is there another way to assign what I want (do not bother about my electricity bill, but only about my curiosity)?
@xilman: If you have any idea, where I could use my processors better, please let me know. If something more useful can be done, lets do it then . Last fiddled with by bloodIce on 20100201 at 22:05 
20100201, 22:23  #5 
6809 > 6502
"""""""""""""""""""
Aug 2003
101ร103 Posts
2×3×1,753 Posts 
If you absolutely feel that you need to do that, you can do it and turn in the result. Since the server won't assign that (since the CPU is better used by doing ECM), it won't give you an assignment key. There are are ways to do the work. If you poke around the forum you may find them. While you are doing that, maybe you can do some ECM. If a factor is found by ECM, it may lead to the complete factorization. 971 (the last of the small expos without a known factor) has a factor of 174 bits. It is a complete waste of time to try a work your way up to that level.
Last fiddled with by Uncwilly on 20100201 at 22:24 
20100201, 22:25  #6 
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
3·11·157 Posts 
Besides Electricity, are you aware that according to http://mersennearies.sili.net/credit.php ... which is proven reliable
Factor=1061,62,63  would take 1 core of a highend Quad much of a year to complete? Factor=1061,81,82  ... in the order of 100 Million years? 
20100201, 22:32  #7  
A Sunny Moo
Aug 2007
USA (GMT5)
3·2,083 Posts 
Quote:


20100201, 22:37  #8  
6809 > 6502
"""""""""""""""""""
Aug 2003
101ร103 Posts
2×3×1,753 Posts 
Quote:
I would suggest that you ask some who knows what bounds to run, instead of what you have been doing. Code:
History 3 curves, B1=260000000, B2=26000000000 by "THK" on 20100130 History 3 curves, B1=260000000, B2=26000000000 by "THK" on 20100130 History 3 curves, B1=260000000, B2=26000000000 by "THK" on 20100130 History 3 curves, B1=260000000, B2=26000000000 by "THK" on 20100130 History 100 curves, B1=1000000, B2=100000000 by "ANONYMOUS" on 20100130 History 100 curves, B1=1000000, B2=100000000 by "ANONYMOUS" on 20100130 History 100 curves, B1=1000000, B2=100000000 by "ANONYMOUS" on 20100130 History 100 curves, B1=1000000, B2=100000000 by "ANONYMOUS" on 20100130 History 100 curves, B1=1000000, B2=100000000 by "ANONYMOUS" on 20100130 History 100 curves, B1=1000000, B2=100000000 by "ChuckEtienne" on 20100131 History 2 curves, B1=1000000, B2=100000000 by "BloodIce" on 20100131 History 2 curves, B1=1000000, B2=100000000 by "BloodIce" on 20100131 History 100 curves, B1=1000000, B2=100000000 by "BloodIce" on 20100131 History 10 curves, B1=10000000, B2=1000000000 by "BloodIce" on 20100131 History 10 curves, B1=12000000, B2=1200000000 by "BloodIce" on 20100131 History 100 curves, B1=3000, B2=300000 by "BloodIce" on 20100131 History 500 curves, B1=30000, B2=3000000 by "BloodIce" on 20100131 History 100 curves, B1=30000, B2=30000000 by "BloodIce" on 20100131 History 50 curves, B1=300000, B2=300000000 by "BloodIce" on 20100131 History 100 curves, B1=200000, B2=20000000 by "BloodIce" on 20100131 History 10 curves, B1=1000000, B2=100000000 by "BloodIce" on 20100131 History 400 curves, B1=50000, B2=5000000 by "BloodIce" on 20100201 

20100201, 22:39  #9 
Jun 2003
23·233 Posts 

20100201, 22:41  #10 
A Sunny Moo
Aug 2007
USA (GMT5)
3×2,083 Posts 

20100201, 22:58  #11  
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
3·11·157 Posts 
Quote:
Quote:
Homework: a. How many 2kp+1 possibilities are there at 62 bits for p=1061? b. How many for p=2,000,001? c. What is the ratio? i.e. How many times more work is involved? 1061 is small number in itself and so 2^10611 has the illusion of being small however it is over 300 digits long. 

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