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Difference between revisions of "PrimeGrid Generalized Fermat Prime Search"
m (add ref for GFN 17 Low ending) |
(Mention end of GFN-15 at b = 460 million) |
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"Genefer 17" (where {{Vn}} = 17) was split into two sub-projects: | "Genefer 17" (where {{Vn}} = 17) was split into two sub-projects: | ||
| − | * "Genefer 17 Low", testing {{Vb}} < 42,597,774, completed.<ref>[https://www.primegrid.com/forum_thread.php?id=9796 GFN-17-LOW will finish soon - PrimeGrid forums]</ref> | + | * "Genefer 17 Low", testing {{Vb}} < 42,597,774, completed in January 2022.<ref>[https://www.primegrid.com/forum_thread.php?id=9796 GFN-17-LOW will finish soon - PrimeGrid forums]</ref> |
* "Genefer 17 Mega", testing {{Vb}} ≥ 42,597,774 (the smallest {{Vb}} necessary to find megaprimes) | * "Genefer 17 Mega", testing {{Vb}} ≥ 42,597,774 (the smallest {{Vb}} necessary to find megaprimes) | ||
There is also "Do You Feel Lucky?", a variant of Genefer 22 (where {{Vn}} = 22) designed to find world record primes. It is currently searching {{Vb}} ≥ 846,398, the smallest {{Vb}} necessary such that any prime found would be larger than [[M51]], making it a world record prime number. If a new world record is found outside of PrimeGrid then this project will jump up to the minimum {{Vb}} needed to surpass that number.<ref>[https://www.primegrid.com/forum_thread.php?id=8422&nowrap=true#125716 Do You Feel Lucky? - PrimeGrid forums]</ref> | There is also "Do You Feel Lucky?", a variant of Genefer 22 (where {{Vn}} = 22) designed to find world record primes. It is currently searching {{Vb}} ≥ 846,398, the smallest {{Vb}} necessary such that any prime found would be larger than [[M51]], making it a world record prime number. If a new world record is found outside of PrimeGrid then this project will jump up to the minimum {{Vb}} needed to surpass that number.<ref>[https://www.primegrid.com/forum_thread.php?id=8422&nowrap=true#125716 Do You Feel Lucky? - PrimeGrid forums]</ref> | ||
| + | |||
| + | "Genefer 15", the {{vn}} = 15 search, was terminated in November 2023 at {{Vb}} = 4.6 • 10<sup>8</sup>.<ref>[https://www.primegrid.com/forum_thread.php?id=10333 PPS-Sieve, PPS-MEGA, GFN-15, SGS, and AP27 are shutting down - PrimeGrid Forums]</ref> | ||
== Primes found == | == Primes found == | ||
Revision as of 16:26, 25 November 2023
The Generalized Fermat Prime Search is a PrimeGrid sub-project, launched in 2009.[1] It is sometimes abbreviated to "Genefer" or "GFN". It is searching for Generalized Fermat prime numbers.
Contents
Purpose
The project is searching for primes of the form b2n+1 where:
- 15 ≤ n ≤ 22
- b ≤ 2 • 109
"Genefer 17" (where n = 17) was split into two sub-projects:
- "Genefer 17 Low", testing b < 42,597,774, completed in January 2022.[2]
- "Genefer 17 Mega", testing b ≥ 42,597,774 (the smallest b necessary to find megaprimes)
There is also "Do You Feel Lucky?", a variant of Genefer 22 (where n = 22) designed to find world record primes. It is currently searching b ≥ 846,398, the smallest b necessary such that any prime found would be larger than M51, making it a world record prime number. If a new world record is found outside of PrimeGrid then this project will jump up to the minimum b needed to surpass that number.[3]
"Genefer 15", the n = 15 search, was terminated in November 2023 at b = 4.6 • 108.[4]
Primes found
As of July 2023 over 7,000 primes have been found. Full list from PrimeGrid's website
The largest four finds have been GFN-20s:
- 2022-09-24: 19637361048576+1
- 2022-08-09: 19517341048576+1
- 2018-10-31: 10590941048576+1
- 2017-08-29: 9194441048576+1
Status
References
| Miscellaneous |
| Subprojects |
|
| Completed |
| Others |
