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Difference between revisions of "PrimeGrid Sophie Germain Search"
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| − | The '''Sophie Germain Search''' | + | The '''Sophie Germain Search''' was a [[PrimeGrid]] sub-project searching for [[Sophie Germain prime|Sophie Germain]] and [[Twin prime]] pairs. It was launched in 2009 as a successor to the Twin Prime Search sub-project. The project ended in December 2023.<ref>[https://www.primegrid.com/forum_thread.php?id=10333#165213 PPS-Sieve, PPS-MEGA, GFN-15, SGS, and AP27 are shutting down - PrimeGrid Forums]</ref> |
==Search range== | ==Search range== | ||
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==Found primes== | ==Found primes== | ||
| − | + | The project found over 12200 primes, with 2 Sophie Germain pairs and 2 Twin pairs. Each of these discoveries are currently the largest and second largest known pairs in their respective categories. | |
===Sophie Germain pairs=== | ===Sophie Germain pairs=== | ||
Revision as of 10:24, 16 December 2023
The Sophie Germain Search was a PrimeGrid sub-project searching for Sophie Germain and Twin prime pairs. It was launched in 2009 as a successor to the Twin Prime Search sub-project. The project ended in December 2023.[1]
Contents
Search range
The current iteration of the project is searching for prime numbers of the form k•21290000-1, for k ≤ 1013.
PrimeGrid Forum thread is not current, still data for n=666666 given (k ≤ 41 • 1012).
Sophie Germain pairs take the form k•21290001-1 or k•21289999-1, and Twin pairs take the form k•21290000+1.[2]
As of July 2023, the search is currently at k ≥ 8.3 • 1012. (Live status)
The first version of the project searched for prime numbers k•2n-1 for 666,666 ≤ n ≤ 666,691 with varying ranges of k values up to 38.5 • 1012.
Found primes
The project found over 12200 primes, with 2 Sophie Germain pairs and 2 Twin pairs. Each of these discoveries are currently the largest and second largest known pairs in their respective categories.
Sophie Germain pairs
- 2618163402417•21290000-1 and 2618163402417•21290001-1 on 2016-02-29 (official announcement)
- 18543637900515•2666667-1 and 18543637900515•2666668-1 on 2012-04-09 (official announcement)
Twin pairs
- 2996863034895•21290000-1 and 2996863034895•21290000+1 on 2016-09-14 (official announcement)
- 3756801695685•2666669-1 and 3756801695685•2666669+1 on 2011-12-25 (official announcement)
References
See also
External links
| Miscellaneous |
| Subprojects |
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| Completed |
| Others |
