20111102, 13:08  #1 
Oct 2002
France
2×5×13 Posts 
The Month of Double Check effort
Hi,
there is almost a gap of 20M exponents between head of LL and LLD. I don't know if this option has already been discussed, but there is maybe a solution to fill the gap without annoying LL workers. Primenet could set up something called "The Month of the Double Check". During one month by year (not too much), P95 users with option "Whatever makes the most sense" will receive only double check exponents to compute. This will help to reduce the gap and to prove M4X. What do you think about? Thanks, Last fiddled with by Aillas on 20111102 at 13:09 Reason: Change title 
20111102, 13:19  #2 
Romulan Interpreter
Jun 2011
Thailand
5·1,889 Posts 
My twopence is: there is no need for it. Why we would want the DC front to catch up with LL front? If we would do so, then many old computers who now are crunching doublechecks would be out of business....
There is a long discussion here around somewhere... 
20111102, 15:13  #3 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
3×29×83 Posts 
Well, I do have two going right now, out of three workers, but then it's LL until December. LaurV, it seems to me that one month a year would not push it anywhere near the current wavefront; that's progressing relatively quickly at (it seems) a million every couple of months. Even if we pushed the DC wavefront from 28M to 38M, that would be a huge increase yet still leave >10M available for old DC machines.

20111102, 15:31  #4  
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
3^{2}×5×103 Posts 
Quote:


20111102, 15:55  #5  
"Lucan"
Dec 2006
England
2·3·13·83 Posts 
Quote:
venture is a load of crap. Pakistani cricketers notwithstanding, it is a racing certainty that there are no more primes below 50M. Unless we get the LL wavefront going, we ain't gonna find another prime for about 6 years. And if the DC wavefront was 4x smaller than 1st time LLs, that would make DC a better bet for finding one of the *******s David 

20111102, 15:57  #6  
"Lucan"
Dec 2006
England
14512_{8} Posts 
Quote:
David 

20111102, 16:14  #7  
Oct 2002
France
2·5·13 Posts 
Quote:
Quote:
I didn't know about this feature. But it's not incompatible with my proposal 

20111102, 23:11  #8  
"Richard B. Woods"
Aug 2002
Wisconsin USA
2^{2}×3×641 Posts 
Quote:
DC is for: (1) proving that Mersenne numbers shown to be composite by the first LL test are also shown to be composite by a second LL test with matching residue, or (2) showing that the first LL test result may have been erroneous (because the second LL test returns a different nonzero residue), and thus that the particular Mersenne number needs to be triplechecked, or (3) (a remote possibility) finding (not proving) a Mersenne prime that was previously missed because the first LL test on that number returned an erroneous nonzero residue. Proving a Mersenne prime (after an LL test has returned a zero residue) is done by immediately repeating the LL test for that number on fast dedicated systems, not by making a DC assignment through PrimeNet.   Now, it is sometimes said that completing the DCs for all exponents below a certain limit has proved that there are no remaining undiscovered Mersenne primes below that limit. But this means that all remaining nonprimes (i.e., omitting the known Mersenne primes) below that limit are proved to be composite  not the same as proving any of them to be prime. 

20111102, 23:49  #9  
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
16065_{8} Posts 
Quote:


20111103, 00:14  #10  
Dec 2010
Monticello
5×359 Posts 
Quote:


20111103, 00:33  #11 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
3×29×83 Posts 

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