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Difference between revisions of "PrimeGrid Sophie Germain Search"
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==Search range== | ==Search range== | ||
| − | The current iteration of the project is searching for prime numbers of the form {{Kbn|k|1290000}}, for ''k'' ≤ 10<sup> | + | The current iteration of the project is searching for prime numbers of the form {{Kbn|k|1290000}}, for ''k'' ≤ 10<sup>13</sup>. |
{{C|red|2=This k-range is already done! PrimeGrid Forum thread is not current, still data for n=666666 given (''k'' ≤ 41 • 10<sup>12</sup>).}} | {{C|red|2=This k-range is already done! PrimeGrid Forum thread is not current, still data for n=666666 given (''k'' ≤ 41 • 10<sup>12</sup>).}} | ||
Revision as of 15:15, 19 June 2020
The Sophie Germain Search is 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.
Contents
Search range
The current iteration of the project is searching for prime numbers of the form k•21290000-1, for k ≤ 1013.
This k-range is already done! PrimeGrid Forum thread is not current, still data for n=666666 given (k ≤ 41 • 1012).
Sophie Germain pairs take the form k•21290001-1, and Twin pairs take the form k•21290000+1.
As of June 2020, the search is currently at k = 5.4 • 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
As of June 2020 the project has found over 8200 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)
