20040608, 01:42  #12 
Oct 2003
Australia, Brisbane
111010110_{2} Posts 
The way mersennearies works is I get hrf3.txt (a list of exponents that have at least one LL test but not a matching LL test) and compare it to pminus1.txt (which shows the amount of p1 factoring that has been done on an exponent). Any exponent that appears in hrf3 but not in pminus1 is a candidate for mersennearies.
However, mersennearies only works on certain ranges. We only work on ranges that are not yet on primenet. For example, double checks up to 12.5M are all on primenet, so we wouldn't work on any exponent less than 12.5M. There are however people who use the semiautomated way of p1 testing that will pick up any exponents that we weren't able to complete before it goes to primenet. The way the semiautomated way works is that you reserve a large number of double checks, any that finish with ,1 (for example DoubleCheck=12000000,64,1) are unreserved again straight away as these have already been p1 tested. The user would have also set up sequentialworktodo=0 which means that all the p1 tests are done before any of of the LL tests are done. When all the p1 tests are done, and prime95 is about to start on the first doublecheck, all the exponents are unreserved. The only thing wrong with the semiautomated method is that it is hard to get enough work to do. Thats why I choose to do it manually and I also post ranges for other people to do if they are interested in doing p1 tests. 
20040608, 02:20  #13  
Nov 2002
Anchorage, AK
357_{10} Posts 
Quote:


20040924, 23:25  #14  
"James Heinrich"
May 2004
exNorthern Ontario
2×17×103 Posts 
I just found a 43digit factor that beats your 43digit ones (but not your 45digit one, naturally.)
Quote:


20040925, 11:17  #15  
"Sander"
Oct 2002
52.345322,5.52471
29×41 Posts 
Quote:
PRIME FACTOR 471463684608646013689 PRIME FACTOR 9169551529965486638129 

20040925, 12:23  #16 
Oct 2003
Australia, Brisbane
2·5·47 Posts 
My site doesn't care if it is composite or not.
I think that all the biggest factors on my website are composite. I know that all of mine are. 
20040925, 12:34  #17 
Oct 2003
Australia, Brisbane
2·5·47 Posts 
I just checked the biggest 10 factors found on my website (I don't have the time right now to do all 20) and found that the first 6 were composite and 710 are prime.
Here are the results.... Code:
1. 3514233865018526446562065785595542962972195753 = 18154642898050009861369 x 193572183421795109797937 2. 264230314763760208834215981504580626343342447 = 46673864303955381847 x 5661205017073505552389801 3. 2975472867644373392513490171544511832022967 = 26296325190058952183 x 113151660779173033002049 4. 2855451057157704997579326497626590663028969 = 896774094182730749591 x 3184136423744490284159 5. 539258302657028676888051495655820038433881 = 714126009831643980041 x 755130460496963884241 6. 4371171811087722702718399628583483010153 = 21095721627240372769 x 207206555354017323337 7. 1352314223931668429560551466249 is prime 8. 1108632484832796568785498537761 is prime 9. 1055342220095616061072926313001 is prime 10. 374624776575285733098513989353 is prime 
20070903, 20:15  #18  
Jun 2003
7×167 Posts 
Quote:
Code:
[Fri May 23 14:34:48 2003] P1 found a factor in stage #2, B1=50000, B2=887500. UID: daran/1, M8680409 has a factor: 4516743717642484934632779029209 Last fiddled with by Mr. P1 on 20070903 at 20:16 

20080128, 21:43  #19 
Jun 2003
7·167 Posts 
M25223287 has a 32 digit factor: 14737136146082922801302859492631

20080129, 10:47  #20 
"James Heinrich"
May 2004
exNorthern Ontario
2×17×103 Posts 

20080130, 16:40  #21 
Jun 2003
7·167 Posts 
I've had a couple of 140+ bit composite factors, which are nice to find, but the underlying primes aren't so impressive. This is my second 100+ bit prime factor.
They're still pretty meager compared to these monsters. 
20080201, 21:43  #22  
Bamboozled!
"πΊππ·π·π"
May 2003
Down not across
25312_{8} Posts 
Quote:
However, I'm trying again on generalized Cullen and Woodall numbers and have managed a p46 so far this run. Still almost 10,000 composites to go before the entire collection is swept to B1=1e9 so there's plenty of opportunities yet. Paul 

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