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Difference between revisions of "PrimeGrid 321 Prime Search"
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==Primes found== | ==Primes found== | ||
| − | *2023-07-06: {{NRi|3|20928756}}, [[Arno Lehmann]] | + | *2023-07-06: {{NRi|3|20928756}}, [[Arno Lehmann]] ([https://www.primegrid.com/download/321-20928756.pdf Official announcement]) |
*2022-03-24: {{NRi|3|18924988}}, [[Frank Matillek]] ([https://www.primegrid.com/download/321-18924988.pdf Official announcement]) | *2022-03-24: {{NRi|3|18924988}}, [[Frank Matillek]] ([https://www.primegrid.com/download/321-18924988.pdf Official announcement]) | ||
*2022-01-18: {{NRi|3|18196595}}, (Anonymous) ([https://www.primegrid.com/download/321-18196595.pdf Official announcement]) | *2022-01-18: {{NRi|3|18196595}}, (Anonymous) ([https://www.primegrid.com/download/321-18196595.pdf Official announcement]) | ||
Latest revision as of 12:24, 31 July 2024
Purpose
PrimeGrid 321 Prime Search is an extension of Paul Underwood’s 321 Search since 2008.
PrimeGrid has added the 3•2n+1 form to the search and will be testing both 3•2n-1 and 3•2n+1 forms beyond n=5000000.
Status
- The current nmax = 21,851,244 as of 2024-07-31 (see Multi Reservation 22).
- 321 Prime Search status at PrimeGrid
Primes found
- 2023-07-06: Riesel 3•220928756-1, Arno Lehmann (Official announcement)
- 2022-03-24: Riesel 3•218924988-1, Frank Matillek (Official announcement)
- 2022-01-18: Riesel 3•218196595-1, (Anonymous) (Official announcement)
- 2021-09-06: Riesel 3•217748034-1, Marc Wiseler (Official announcement)
- 2021-01-20: Riesel 3•216819291-1, Rudi Tapper (Official announcement)
- 2020-10-25: Proth 3•216408818+1, James Scott Brown (Official announcement)
- 2015-06-23: Riesel 3•211895718-1, Michael Schulz (Official announcement)
- 2015-03-13: Riesel 3•211731850-1, Karsten Klopffleisch (Official announcement)
- 2014-11-22: Riesel 3•211484018-1, Serhiy Gushchak (Official announcement)
- 2012-01-14: Proth 3•210829346+1, Sai Yik Tang (Official announcement)
- 2011-02-21: Proth 3•27033641+1, Michael Herder (Official announcement)
- 2010-04-24: Riesel 3•26090515-1, David Mumper (Official announcement)
- 2009-04-03: Proth 3•25082306+1, Andy Brady (Official announcement)
- 2008-08-11: Proth 3•22291610+1, Thomas Wolfram (Official announcement)
- 2008-03-23: Riesel 3•24235414-1, Dylan Bennett (Official announcement)
Total: 15 primes found
History
See also
External links
- 321 Prime Search - PrimeGrid forums
- History of 321 Search at MersenneForum
- Overview at 321 Search at MersenneForum
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