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Old 2018-01-16, 23:33   #397
gd_barnes
 
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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 n-range needs to be sieved. I see that you have started on n=2^24-2^26 (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 n-range. To the best of my knowledge they have only sieved all k<=10000 for n=9M-12M 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 even-n.

One more thing to avoid some previous confusion: Please make sure that you guys are only sieving even-n. :-)

This may possibly be the highest n-range ever sieved or factored outside of GIMPS.

Last fiddled with by gd_barnes on 2018-01-16 at 23:53
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Old 2018-01-17, 00:06   #398
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After milion nines:)

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So Gary, if I understand correctly can I make "ordinary sieve" on sequence 9519*2^n-1 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.
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Old 2018-01-17, 00:10   #399
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Quote:
Originally Posted by pepi37 View Post
So Gary, if I understand correctly can I make "ordinary sieve" on sequence 9519*2^n-1 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.
Yes. Just sieve to some low limit and then remove all of the odd n's.

Alternatively you can sieve 9519*4^n-1 at half the n-range, i.e. 2^23-2^25 (n=8388608 to 33554432). No n-removal 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 2018-01-17 at 00:11
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Old 2018-01-17, 00:15   #400
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After milion nines:)

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Quote:
Originally Posted by gd_barnes View Post
Yes. Just sieve to some low limit and then remove all of the odd n's.

Alternatively you can sieve 9519*4^n-1 at half the n-range, i.e. 2^23-2^25 (n=8388608 to 33554432). No n-removal 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.
Very interesting :)
I will not start anything , dont worry :)
But idea with GPU still stay...
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Old 2018-01-17, 15:53   #401
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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.
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Old 2018-02-13, 07:28   #402
Jean Penné
 
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Hi,

k=9267 is now tested up to n = 9,003,487 (2,710,324 decimal digits) no prime, continuing...

Best Regards,
Jean
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Old 2018-04-01, 06:11   #403
Jean Penné
 
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Hi,

k=9267 is now tested up to n = 9,200,215 (2,769,545 decimal digits) no prime, continuing...

Best Regards,
Jean
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Old 2018-05-21, 14:41   #404
Jean Penné
 
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Default 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
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Old 2018-07-03, 15:37   #405
Jean Penné
 
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Default 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
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Old 2018-09-24, 06:16   #406
Jean Penné
 
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Default 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
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Old 2018-11-03, 15:29   #407
Jean Penné
 
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Default 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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