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Message boards : General discussion : Question about prime number ( Top 5000)

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Crun-chi
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Message 96917 - Posted: 18 Jul 2016 | 11:44:05 UTC

I know you must have some alarm that beeps when someone find prime. And I am also sure that alarms beep all the time.
But I have question: suppose I have many computers and one of them find prime. But wingman abort that task, and so on and so on.
Does you send prime to Top 5000 only after wingman confirm prime, or you reconfirm it before , and regardless status of wingman result send it to Top 5000?

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Michael Goetz
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Message 96923 - Posted: 18 Jul 2016 | 12:56:41 UTC - in response to Message 96917.

I know you must have some alarm that beeps when someone find prime. And I am also sure that alarms beep all the time.
But I have question: suppose I have many computers and one of them find prime. But wingman abort that task, and so on and so on.
Does you send prime to Top 5000 only after wingman confirm prime, or you reconfirm it before , and regardless status of wingman result send it to Top 5000?

We report to T5K after the prime has been confirmed. For small primes, (or primes of any size that are likely to be false) that means waiting for the double checker. For large primes (excluding WOO, TRP, and some 321 because they're almost always computation errors), we'll check them ourselves to speed up the wait.
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Message 101955 - Posted: 9 Dec 2016 | 3:13:41 UTC - in response to Message 96923.

Sorry to bring back an older question. Given the total number of primes found far exceeds the "top 5,000" list, what happens to "smaller" primes when they're no longer in the top 5,000? Is there a database of primes found by the project elsewhere? Probably equally importantly, is there a database that summarizes the areas that have been searched that didn't yield primes, so others don't need to replicate the same work in the future?

Michael Goetz
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Message 101956 - Posted: 9 Dec 2016 | 6:06:01 UTC - in response to Message 101955.

Sorry to bring back an older question. Given the total number of primes found far exceeds the "top 5,000" list, what happens to "smaller" primes when they're no longer in the top 5,000? Is there a database of primes found by the project elsewhere? Probably equally importantly, is there a database that summarizes the areas that have been searched that didn't yield primes, so others don't need to replicate the same work in the future?

Look left.

Now look down. (Or look up, depending on how you have your forums preferences set.)

See where it says "Results"? Click on the link for "PrimeGrid Primes by Project". That's a comprehensive list of all primes found at PrimeGrid.

When a prime that is already in the Top 5000 list rolls off the bottom of the list, it doesn't get removed from the list. It's still there, but it's no longer in the top 5000. (I've found 4 primes over the years that were entered into the Top 5000. They're currently ranked 24, 2010, 22083, and 23121.) As newer and larger primes get found, that database grows. I believe there's well over 100,000 primes in the Top 5000 database.

The old primes are still there, but you can't ADD any more primes unless they would be in the current top 5000. So we can't report GFN-15 primes any more. Sometime next year, we'll probably have to stop reporting SGS primes because they will be too small. But all the current (and past) SGS primes will still be there, as are all the GFN15 primes from years ago when they were in the top 5000.

With regards to "which areas have been searched", that's not so easy. PrimeGrid isn't always the entity that's keeping track of who is searching what, so we're not able to provide that information. Other than that, it's a good bet the answer to the question "what has been searched" is simply "everything below the leading edge."

You did specifically say "in the future", so if you're asking about a post-PrimeGrid era, or simply when we've shut some project's down, we would at that time publish the limits of our completed searches. We don't shut down projects very often, but if you look for example at the 2009 AP26 project, when the first AP26 was found and the project was terminated, we listed the search limits for the 6 shifts that were in use. I expect we'll do the same if and when anything else shuts down.
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Message 101976 - Posted: 10 Dec 2016 | 2:54:28 UTC - in response to Message 101956.

Wow, very through and great answers. Thank you!

Message boards : General discussion : Question about prime number ( Top 5000)