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Old 2008-07-27, 18:26   #1
ltd
 
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Smile New PRP found

Sloth did it again.

we have a new PRP. Its 258317*2^5450519+1

Official proving is in progress:

http://primes.utm.edu/primes/page.php?id=85350

As we have rechecked the number on two different machines already(Thanks to Joe_O) we are quite sure that it is really prime.

So the k is removed from all queues and a new sieving dat file is created and can be downloaded at the usual place.

Thanks to all the contributors here and at primegrid who made it possible to find a new prime within such a short time.

Stats will show it as soon as the prime is official.


Last fiddled with by ltd on 2008-07-27 at 18:27
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Old 2008-07-27, 20:08   #2
mdettweiler
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Hmm...since it was done with LLR (which does a Proth test, not a PRP test, on k*2^n+1 numbers), shouldn't the title say "new prime found" instead of "new PRP found" (since "PRP" would indicate that it's only a probable prime)?
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Old 2008-07-27, 21:55   #3
Wacky
 
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Quote:
Originally Posted by Anonymous View Post
shouldn't the title say "new prime found" instead of "new PRP found" (since "PRP" would indicate that it's only a probable prime)?
No, it is still "probable" until they complete all of the verification tests that they feel are necessary to assure that there was not an error in the computation which might have led to a false positive.
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Old 2008-07-27, 22:22   #4
mdettweiler
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Quote:
Originally Posted by Wacky View Post
No, it is still "probable" until they complete all of the verification tests that they feel are necessary to assure that there was not an error in the computation which might have led to a false positive.
Well, since they've already checked it three times by now, I'd say the chances of it being composite are just about nil.
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Old 2008-07-27, 22:32   #5
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I don't disagree with your assessment. However, WE are not in a position to make a declaration. I am sure that THEY will amend their declaration when THEY are ready.
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Old 2008-07-28, 17:36   #6
ltd
 
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There are three reasons why I wrote PRP.
First and most important it was a reflex comming from the start of the project when everything was PRP and had to be rechecked by other programms.

Second I think it is worth to call it PRP until it is checked by an independant source using different tools.

Third I never really thought about the wording.
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Old 2008-07-28, 20:37   #7
Nekto
 
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Good job!
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Old 2008-07-29, 04:02   #8
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Sigh. I know I've said it many times before, but... Y'all need to better coordinate with Prof. Caldwell so that such BIG primes are not verified by prime pages again -- it achieves nothing more than tying up the prime pages machines.

Oh, and big congrats to everyone
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Old 2008-07-29, 04:45   #9
Jean Penné
 
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Many congrats to everyone! I think you are now really competing with SoB...
Best Regards,
Jean
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Old 2008-07-29, 07:23   #10
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Nice to hear! You guys are the best!

That's mean not only new prime, but also overall speed increase in sieving.

Now I want new prime in SoB ))))
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Old 2008-07-29, 07:25   #11
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And btw, everybody can grab some primality check program and check it by yourself. ;-)
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