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The '''Sophie Germain Search''' is 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.
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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==
The current iteration of the project is searching for prime numbers of the form {{Kbn|k|1290000}}, for ''k'' ≤ 10<sup>13</sup>.  
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The most recent iteration of the project searched for prime numbers of the form {{Kbn|k|1290000}}, for ''k'' ≤ 10<sup>13</sup>.  
 
 
{{C|red|2=PrimeGrid Forum thread is not current, still data for n=666666 given (''k'' ≤ 41 • 10<sup>12</sup>).}}
 
  
 
Sophie Germain pairs take the form {{Kbn|k|1290001}} or {{Kbn|k|1289999}}, and Twin pairs take the form {{Kbn|+|k|1290000}}.<ref>[https://www.primegrid.com/forum_thread.php?id=1450&nowrap=true#70736 PrimeGrid forum post - 8 Nov 2013]</ref>
 
Sophie Germain pairs take the form {{Kbn|k|1290001}} or {{Kbn|k|1289999}}, and Twin pairs take the form {{Kbn|+|k|1290000}}.<ref>[https://www.primegrid.com/forum_thread.php?id=1450&nowrap=true#70736 PrimeGrid forum post - 8 Nov 2013]</ref>
  
As of July 2023, the search is currently at k ≥ 8.3 • 10<sup>12</sup>. ([https://www.primegrid.com/stats_sgs_llr.php Live status])
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The project reached its end point, ''k'' = 10<sup>13</sup>, in December 2023. ([https://www.primegrid.com/stats_sgs_llr.php Live status])
  
 
The first version of the project searched for prime numbers {{Kbn|k|n}} for 666,666 ≤ ''n'' ≤ 666,691 with varying ranges of ''k'' values up to 38.5 • 10<sup>12</sup>.
 
The first version of the project searched for prime numbers {{Kbn|k|n}} for 666,666 ≤ ''n'' ≤ 666,691 with varying ranges of ''k'' values up to 38.5 • 10<sup>12</sup>.
  
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{{C|red|2=PrimeGrid Forum thread is not current, still data for n=666666 given (''k'' ≤ 41 • 10<sup>12</sup>).}}
 
==Found primes==
 
==Found primes==
As of July 2023 the project has found over 10800 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.
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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===

Latest revision as of 15:13, 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]

Search range

The most recent iteration of the project searched for prime numbers of the form k•21290000-1, for k ≤ 1013.

Sophie Germain pairs take the form k•21290001-1 or k•21289999-1, and Twin pairs take the form k•21290000+1.[2]

The project reached its end point, k = 1013, in December 2023. (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.

PrimeGrid Forum thread is not current, still data for n=666666 given (k ≤ 41 • 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

  1. 2618163402417•21290000-1 and 2618163402417•21290001-1 on 2016-02-29 (official announcement)
  2. 18543637900515•2666667-1 and 18543637900515•2666668-1 on 2012-04-09 (official announcement)

Twin pairs

  1. 2996863034895•21290000-1 and 2996863034895•21290000+1 on 2016-09-14 (official announcement)
  2. 3756801695685•2666669-1 and 3756801695685•2666669+1 on 2011-12-25 (official announcement)

References

See also

External links

PrimeGrid