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Riesel primes of the form 221•2n-1
Current data
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History
- 2021-02-13: Checked to n = 2000000, Gary Barnes, double-check n=1000000-1850000, released
- 2021-02-13: Reserved by Gary Barnes
- 2014-09-13: Checked to n = 1850000, Steven Tjung
- 2013-08-22: Checked to n = 1500000, Steven Tjung
- 2012-08-19: Checked to n = 1100000, Steven Tjung
- 2009-12-05: Checked to n = 1100000, Steven Tjung
- 2009-05-15: Checked to n = 1050000, Steven Tjung
- 2009-04-06: none, Steven Tjung
- 2009-02-12: Checked to n = 1000000, Steven Tjung
- 2008-12-03: Checked to n = 860000, Michael Curtis
- 2008-10-26: Found n = 749166, Michael Curtis
- 2008-03-15: Reserved by Michael Curtis
- 2008-03-01: Checked to n = 740000, Borys Jaworski, released
- 2008-02-25: Found n = 730986, Borys Jaworski
- 2008-02-09: Checked to n = 700000, Borys Jaworski
- 2008-02-03: Checked to n = 690000, Borys Jaworski
- 2008-01-12: Checked to n = 650000, Borys Jaworski
- 2008-01-06: Checked to n = 640000, Borys Jaworski
- 2007-10-01: Reserved by Borys Jaworski
- 1998-11-30: Found n = 34986, Wilfrid Keller
