20040811, 10:54  #1 
Jun 2004
France [UTC+2]
14_{10} Posts 
over trial factoring
hello.
out of result.txt: 33,872,239 trial factoring up to 72 33,697,229 up to 70 34,004,779 up to 70 (these are only examples). I've got 2 questions :  is it done by manual overriding worktodo.ini ?  is it worth factoring further 69 ? thanks JFB. 
20040811, 14:48  #2  
Sep 2003
Borg HQ, Delta Quadrant
2BE_{16} Posts 
Quote:
Now the only question remaining is how much trial factoring should be done? The answer depends on three variables: the cost of factoring, the chance of finding a factor, and the cost of a primality test. The formula used is: factoring_cost < chance_of_finding_factor * 2 * primality_test_cost That is, the time spent factoring must be less than the expected time saved. If a factor is found we can avoid running both the firsttime and doublecheck primality tests. 

20040811, 17:49  #3 
Jun 2004
France [UTC+2]
2·7 Posts 
Thanks PrimeCruncher, I found FactorOverride parameter in Undocumented Features help.
But its purpose is to limit how far the program tries to factor a number, not to go beyond Prime95 default settings. Are you sure this is the way to deeper the factoring depth ? Have you tested it ? JFB. 
20040811, 17:55  #4  
Sep 2003
Borg HQ, Delta Quadrant
2×3^{3}×13 Posts 
Quote:


20040811, 18:17  #5  
Banned
"Luigi"
Aug 2002
Team Italia
11353_{8} Posts 
Quote:
You can trialfactoring deeper with that option set. Luigi 

20040811, 18:53  #6 
Jun 2004
France [UTC+2]
2·7 Posts 
Thanks Luigi.
"This feature should not be used with the Primenet server" (Undoc.Feat.). Did you encounter problem using it ? JFB. 
20040811, 18:56  #7  
Sep 2003
Borg HQ, Delta Quadrant
2×3^{3}×13 Posts 
Quote:


20040811, 19:33  #8 
Jun 2004
France [UTC+2]
1110_{2} Posts 
I don't understand, PrimeCruncher. Didn't you say you haven't tested it ?
Mmm... Maybe I'm too newB for that matter... I will think about it some time. Anyway thanks to both of you ! JFB. 
20040811, 19:34  #9 
P90 years forever!
Aug 2002
Yeehaw, FL
2^{2}×1,987 Posts 
I don't think using that feature to factor deeper than normal will cause the PrimeNet server any grief.

20040811, 20:05  #10 
Jun 2004
France [UTC+2]
E_{16} Posts 
I take it from whom it comes from !
Il ne faut pas être plus royaliste que le Roi. Thank you Georges. JFB. 
20040811, 21:06  #11 
May 2003
60_{16} Posts 
If I'm not mistaking (and correct me if I'm wrong, George), the FactorOverride parameter is ignored when you use PrimeNet. If "Use Primenet" is unchecked, the program will factor from the number in the worktodo.ini file to the FactorOverride parameter (or to the standard value if FactorOverride is not set).
So, if "Use Primenet" is checked, it always factors to the standard value. 
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