20110113, 11:44  #56  
Banned
"Luigi"
Aug 2002
Team Italia
12E2_{16} Posts 
Quote:
I'm afraid I followed the wrong chain of answers. The old behavior was removed. The actual Prime95 should finish its bit range even if a factor is found. Luigi 

20110113, 15:39  #57 
Sep 2010
Scandinavia
615_{10} Posts 
Which raises my question, again.
Why multiply them? Isn't that sort of the opposite of what we're trying to do here? 
20110113, 22:26  #58  
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
2^{2}×3^{5}×5 Posts 
Quote:
http://mersennearies.sili.net/credi...tton=Calculate Finding the same factor via TF would take over 8.5 quadrillion GhzDays 

20110113, 22:40  #59  
"Richard B. Woods"
Aug 2002
Wisconsin USA
2^{2}×3×641 Posts 
Exactly which ones are you referring to, and which procedure found them? Perhaps there's some mixup.
TF doesn't multiply them. (I've seen TF report two found factors from a single run; it did so on separate "has a factor" lines, not presented as the product of the two.) P1, by its nature, may find the product of two smaller factors at the conclusion of its GCD, rather than finding the two separately. Isn't that the method involved in the case you reference? Quote:
Last fiddled with by cheesehead on 20110113 at 22:45 

20110113, 22:52  #60  
Sep 2010
Scandinavia
3·5·41 Posts 
Quote:
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20110114, 12:59  #61 
Jan 2011
Cincinnati, OH
2^{2}×5^{2} Posts 
This is my largest factor so far
52526609 has a factor: 156325851414571040867100443817329068296081239222450719 Found by P1 
20110114, 13:50  #62 
Sep 2010
Scandinavia
1001100111_{2} Posts 
That's a composite; p24*p30. Still, nice find!

20110115, 10:28  #63  
Jun 2003
7·167 Posts 
Quote:
I'm not aware of any comparable theorem for other k. 

20110115, 10:30  #64 
Jun 2003
7·167 Posts 

20110115, 10:45  #65 
Jun 2003
7·167 Posts 
M39375727 has a factor: 13698938687421045884119517033
M42516611 has a factor: 124316222847533124840651137 The second half of last year was really poor for me. I got no factors at all between 8 August and 26 November. Then three in December, and these twoinarow this month. M39787039 has a factor: 1700513525404800279754718890351 A nice p31 found back in February last year. Last fiddled with by Mr. P1 on 20110115 at 10:48 
20110115, 16:03  #66 
Jan 2011
Cincinnati, OH
2^{2}·5^{2} Posts 
I also agree that we should view composite factors as two smaller ones. Here is my 2nd largest one, also found by P1:
M51443083 has a factor: 25320591696138535897675469195834877349466521 I'm also assuming that this is composite since it is so large. I'm still very new at this, and learning. Can you tell me what you are doing, or using to tell if these numbers are composite or not? Also, maybe I'm getting more than my share, but I've been doing P1 work for 18 months now, and I've found 24 factors in 331 tests, at about a 7.25% rate. Thanks, Doug 
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