20090515, 23:44  #276 
Oct 2007
London, UK
1,307 Posts 
I've finished 3321933893 up to 76 bits, shockingly there were no more factors.
I've also taken 3321933541 up to 75 bits (I'm doing it a bit level at a time in case a factor drops out). Also, I've been playing about a bit, rather a lot actually, and I came up with this: http://2721.hddkillers.com/compare/ Just wondering what you guys think, apart from, "Wow that's a really wide table." It basically compares the main statistics of OBD across both sites and finds the differences. I thought it might help in maintaining consistency across both sites. That link is to the "offline" version which uses saved txt files of the sites, here is the "online" version: http://2721.hddkillers.com/compare/live/ Please don't hit that link too often, because every time you do it downloads 2 pages from More GIMPS (92KiB) and one from Eleven Smooth (53KiB) and I don't want to cause anyone any server issues. The offline version usually loads in around 0.05  0.1 seconds, the online version usually takes around 2 seconds. 
20090516, 07:56  #277  
Banned
"Luigi"
Aug 2002
Team Italia
2×2,383 Posts 
Quote:
The discrepancies come from a work that has been done on already factored exponents. I think that William decided not to update the current bit depth because it was not useful for the project (searching factors of Mersenne numbers with more than a billion digits). It was a cumbersome work to update all these exponents in less than 2 weeks. Luigi 

20090516, 12:01  #278 
Banned
"Luigi"
Aug 2002
Team Italia
2×2,383 Posts 
3321933451 from 72 bits to 74 bits.
Luigi 
20090516, 15:15  #279 
"William"
May 2003
New Haven
2·3^{2}·131 Posts 

20090516, 15:16  #280 
Oct 2007
London, UK
51B_{16} Posts 
It seems that the bulk of the differences do come from additional work on already factored exponents, however there is one difference for an inactive exponent, 3321928417. The two sites differ on how deeply it has been trial factored, and this is also responsible for the differing average bit depths between the sites in the first table.
I've completed trial factoring of 3321933541 to 76 bits and found no factors, continuing on to 77 bits now. I think this has pushed the level counter over the top now. 
20090516, 16:36  #281 
"William"
May 2003
New Haven
2·3^{2}·131 Posts 
Level 10 Completed

20090516, 16:55  #282  
Banned
"Luigi"
Aug 2002
Team Italia
2·2,383 Posts 
Quote:
Range 33219340003321936000 has about 97 exponents at 62 bits, of which 51 with factors. Range 33219340003321936000 has about 145 exponents at 62 bits, of which 75 with factors. Is it time to open a new range? Luigi 

20090516, 17:14  #283  
Oct 2007
London, UK
1,307 Posts 
Quote:
Quote:
Last fiddled with by lavalamp on 20090516 at 17:27 

20090516, 17:56  #284  
Banned
"Luigi"
Aug 2002
Team Italia
2×2,383 Posts 
Quote:
Just think that if only one of them were prime, we would wait 500 years before opening a new range I just thought that maybe people won't devote more than 48 hours' time of their machines to this whimsical project, and there are researchers gathering new Mersenne factors. I'll be fine with AND without new ranges. Luigi 

20090516, 19:07  #285  
Oct 2007
London, UK
1307_{10} Posts 
Quote:
Through a nodoubt deeply flawed method, I deduced that if all the unfactored 72, 73 and 74 bit candidates were brought up to 75 bits, 3 would be eliminated. From the same method, I think that bringing 70 fresh candidates from 62 to 75 bits would eliminate 14. These are computationally equivalent according to the More GIMPS CPU calculator (about 15.5K P90 years). The difference would be the number of candidates at 75 bits then. 96 in the first instance, 70 in the second. So in the short term, I guess it depends on if you want to collect more factors, or take more candidates deeper. In the long term they are identical of course, since all these candidates will almost certainly be taken way past this eventually. 

20090516, 21:00  #286  
"William"
May 2003
New Haven
2×3^{2}×131 Posts 
Quote:
Code:
Bits Target Actual >= >= 76 10 10 75 20 23 74 40 25 73 80 53 72 all 109 

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