20120525, 19:59  #1 
Mar 2012
7 Posts 
Picking a specific exponent to TF?
Under advanced>p1, you can select a specific exponent to p1 factor. There is a similar option for ECM factoring and for LL tests, but not for TF. Is there a way to select a specific range and exponent to TF?

20120525, 20:29  #2 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
3×29×83 Posts 
I don't know about using the menus, but you can certainly modify worktodo.txt with a given assignment. Put something like this in it:
Code:
Factor=N/A,exponent,startbitlevel,endbitlevel Code:
Factor=N/A,61253499,69,71 See here for more info. 
20120526, 01:19  #3 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
10010100010101_{2} Posts 
Be sure to check the status of the exponent like this:
http://www.mersenne.org/report_factoring_effort/?exp_lo=67890127&exp_hi=&bits_lo=0&bits_hi=999&txt=0&exassigned=1&B1=Get+Data exp_lo = the starting exponent for your range exp_hi = the ending exponent for your range bits_lo & bits_hi = start and stop bit levels for your query txt: 0 = show as a table, 1 = show as a comma delimited list (useful to make a worktodo) exassigned: 0 = show all, 1 = show only unassigned (useful to make a worktodo) 
20120526, 02:01  #4  
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
10771_{8} Posts 
Quote:
It is frowned upon to complete work assignments that others have assigned to them and intend to complete and get credit for themselves. 

20120526, 02:55  #5 
Mar 2012
7 Posts 
Hmm...
I'm trying to find a factor for M1061, and while there had been enormous amounts of ECM factoring, it has only been trial factored up to 2^63. I tried entering the line into the worktodo.txt as suggested, but I got an error in the communications thread telling me to use ECM instead of trial factoring for that particular exponent. Why? 
20120526, 03:05  #6  
Sep 2011
1011100_{2} Posts 
Quote:


20120526, 03:06  #7  
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
11·863 Posts 
Quote:
http://www.mersenneforum.org/showthread.php?t=14822 http://www.mersenneforum.org/showthread.php?t=14236 http://www.mersenneforum.org/showthread.php?t=3192 http://www.mersenneforum.org/showthread.php?t=6148 http://www.mersenneforum.org/showthread.php?t=12130 http://www.mersenneforum.org/showthread.php?t=16645 

20120526, 03:16  #8  
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
7221_{10} Posts 
Quote:
Edit: http://mersenne.org/report_ecm/?ecm_...ecmnof_hi=2500 You can see that ECM to t60 is complete; that means there's a exp(1)~=37% chance there is a factor of 60 digits (not bits). This also means that there is practically zero chance of a 55 digit or smaller factor.Thread ID 6148 in Uncwilly's post is also about getting it to t60. There has probably been some more ECM done beyond that. Note that Number Field Sieve has been started; sieving will likely be done in a month or two, and after that, it will be a few more months of linear algebra; we should see its factors (regardless of ECM/TF) before Christmas. Last fiddled with by Dubslow on 20120526 at 03:49 

20120526, 10:16  #9  
"Richard B. Woods"
Aug 2002
Wisconsin USA
2^{2}·3·641 Posts 
Quote:
That is, TFing M1061 from 2^63 to 2^64 requires checking 50,000 times as many candidate factors as TFing M50xxxxxx from 2^63 to 2^64 does. Each candidate check may take, say, only 40% as long for M1061 as for M50xxxxxx, but that still leaves a factor of 20,000 in elapsed time. Last fiddled with by cheesehead on 20120526 at 10:19 

20120526, 19:16  #10 
Mar 2012
7 Posts 
Ah, I see, that's what I was missing. Now I see why we haven't been TFing it. Thanks for the help.

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