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Old 2017-01-26, 20:26   #639
paulunderwood
 
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Quote:
Originally Posted by rudy235 View Post
I would think there is no method of proving deterministically such a large prime of that form even if it were a PRP (which apparently it is NOT)
There is ECPP that would prove it -- umpteen centuries of calculation.

Chris tells me that he is going to let it run its course. His server is not doing much, he wrote.

The chance it is a PRP is next to zero
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Old 2017-01-26, 20:30   #640
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Quote:
Originally Posted by paulunderwood View Post

The chance it is a PRP is next to zero
Better to be next to zero then zero
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Old 2017-01-26, 21:59   #641
henryzz
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106661 is a factor
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Old 2017-01-26, 22:31   #642
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Quote:
Originally Posted by henryzz View Post
106661 is a factor
So now it is not more interesting when we know factor :)
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Old 2017-01-27, 04:03   #643
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Quote:
Originally Posted by paulunderwood View Post
There is ECPP that would prove it -- umpteen centuries of calculation.
With infinite time not only ECPP would work. Trial division would also.
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Old 2017-01-27, 04:09   #644
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Quote:
Originally Posted by rudy235 View Post
With infinite time not only ECPP would work. Trial division would also.
Code:
? (3200000/34000)^4*1.25
98083116.820919289759461692269010189054
About 100 million years on my 48 core box for ECPP -- with a 96 core Xeon you could halve that. In fact, with an increase in technology over those millions of years it would be even less. Having said this , the certificate would enormous.

How long for trial division?

Last fiddled with by paulunderwood on 2017-01-27 at 04:41
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Old 2017-01-27, 06:24   #645
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Quote:
Originally Posted by paulunderwood View Post
Code:
? (3200000/34000)^4*1.25
98083116.820919289759461692269010189054
About 100 million years on my 48 core box for ECPP -- with a 96 core Xeon you could halve that. In fact, with an increase in technology over those millions of years it would be even less. Having said this , the certificate would enormous.

How long for trial division?
I am guessing Death of the Universe TM[B][/B] would come first.
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Old 2017-02-19, 15:58   #646
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5,200,000-5,225,000 - 60% complete
5,225,000-5,250,000 - 60% complete
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Old 2017-03-05, 15:12   #647
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5.3M-5.4M complete, no primes.
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Old 2017-03-12, 19:24   #648
pinhodecarlos
 
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Partial results.
Code:
5,200,000-5,220,000 - Carlos         - Complete
5,220,000-5,225,000 - Carlos         - In Progress
5,225,000-5,245,000 - Carlos         - Complete
5,245,000-5,250,000 - Carlos         - In Progress
Attached Files
File Type: zip k5_5200to5220.zip (13.6 KB, 97 views)
File Type: zip k5_5225to5245.zip (12.8 KB, 100 views)
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Old 2017-03-25, 16:20   #649
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5245-5250 complete, no primes. This completes 5225-5250.
Attached Files
File Type: zip k5_5225to5250.zip (16.0 KB, 97 views)
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