20180116, 23:33  #397 
May 2007
Kansas; USA
11·929 Posts 
I think you guys are talking about two different things. This communication confuses me so I'm wondering if you guys are understanding one another. :)
Peter, I believe that you are saying that a larger nrange needs to be sieved. I see that you have started on n=2^242^26 (n=16777216 to 67108864). That range vs. the previously suggested range by Bitcoin of n=2^24 to n=25M. Bitcoin, I believe that you are saying that you can sieve much more deeply as is needed. ...so two different lines of communication. I do not think that Primegrid would have a sieve file for this nrange. To the best of my knowledge they have only sieved all k<=10000 for n=9M12M to P=20P (20e15). [They've also done all n<9M to deeper sieve depths.] To clear things up, Peter, I would suggest that you just send Bitcoin your entire sieve file and he can have Yoyo sieve as deeply as they can. I have no idea what that limit should be but I feel like P=25P (25e15) as suggested by Bitcoin would be a good starting point since it's just low weight evenn. One more thing to avoid some previous confusion: Please make sure that you guys are only sieving evenn. :) This may possibly be the highest nrange ever sieved or factored outside of GIMPS. Last fiddled with by gd_barnes on 20180116 at 23:53 
20180117, 00:06  #398 
Dec 2011
After milion nines:)
10101000011_{2} Posts 
So Gary, if I understand correctly can I make "ordinary sieve" on sequence 9519*2^n1 and then remove all odd candidates from sieve?
If that is true, then GPU can help us alot, since GPU sieve is way faster then CPU sieve. 
20180117, 00:10  #399  
May 2007
Kansas; USA
23753_{8} Posts 
Quote:
Alternatively you can sieve 9519*4^n1 at half the nrange, i.e. 2^232^25 (n=8388608 to 33554432). No nremoval is then needed. But I don't know if a GPU can do anything except base 2. Coordinate with Peter before doing anything. He has probably already removed odd n's or is sieving base 4. He is the starting point for all of this. Last fiddled with by gd_barnes on 20180117 at 00:11 

20180117, 00:15  #400  
Dec 2011
After milion nines:)
3·449 Posts 
Quote:
I will not start anything , dont worry :) But idea with GPU still stay... 

20180117, 15:53  #401 
Jun 2009
670_{10} Posts 
I just sent the file to Mr. Bitcoin, odd n values were removed and P=160e12. As the optimal sieve depth increases with increasing n values I wasn't sure about 25e15. But now I realize it's so much more than what I had for the previous file which went up to n=2^24 I cannot imagine 25e15 to not be enough. Well, we will see.
Any help about using GPUs will be greatly appreciated as nobody wants to waste time. 
20180213, 07:28  #402 
May 2004
FRANCE
2^{4}×5×7 Posts 
Sierpinski odd n's testing
Hi,
k=9267 is now tested up to n = 9,003,487 (2,710,324 decimal digits) no prime, continuing... Best Regards, Jean 
20180401, 06:11  #403 
May 2004
FRANCE
2^{4}×5×7 Posts 
Sierpinski odd n's testing
Hi,
k=9267 is now tested up to n = 9,200,215 (2,769,545 decimal digits) no prime, continuing... Best Regards, Jean 
20180521, 14:41  #404 
May 2004
FRANCE
2^{4}·5·7 Posts 
Sierpinski odd n's testing
Hi,
k=9267 is now tested up to n = 9,400,135 (2,829,727 decimal digits) no prime, continuing... Best Regards, Jean 
20180703, 15:37  #405 
May 2004
FRANCE
2^{4}·5·7 Posts 
Sierpinski odd n's testing
Hi,
k=9267 is now tested up to n = 9,602,743 (2,890,718 decimal digits) no prime, continuing... Best Regards, Jean 
20180924, 06:16  #406 
May 2004
FRANCE
2^{4}×5×7 Posts 
Sierpinski odd n's testing
Hi,
k=9267 is now tested up to n = 10,003,207 (3,011,270 decimal digits) no prime, continuing... Best Regards, Jean 
20181103, 15:29  #407 
May 2004
FRANCE
230_{16} Posts 
Sierpinski odd n's testing
Hi,
k=9267 is now tested up to n = 10,136,695 (3,051,454 decimal digits) no prime, continuing... Best Regards, Jean 
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