Riesel primes of the form 191•2n-1

Current data

k , b : 191 , 2 Type : Low Count : 5 Nash : 314 Max n : 8,000,000 Date : 2024-04-23

226, 3594, 59770, 240802, 4203426

History

• 2024-04-23: Reservation dropped, Thomas Ritschel
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2019-09-28: Checked to n = 8000000, Thomas Ritschel
• 2018-12-03: Checked to n = 7400000, Thomas Ritschel
• 2018-04-11: Checked to n = 7000000, Thomas Ritschel
• 2018-01-03: Checked to n = 6700000, Thomas Ritschel
• 2017-08-03: Checked to n = 6500000, Thomas Ritschel
• 2017-05-02: Checked to n = 6250000, Thomas Ritschel
• 2017-01-01: Checked to n = 6000000, Thomas Ritschel
• 2016-11-02: Checked to n = 5800000, Thomas Ritschel
• 2016-08-21: Checked to n = 5650000, Thomas Ritschel
• 2016-07-01: Checked to n = 5500000, Thomas Ritschel
• 2016-06-04: Checked to n = 5350000, Thomas Ritschel
• 2016-05-01: Checked to n = 5200000, Thomas Ritschel
• 2016-04-03: Checked to n = 5100000, Thomas Ritschel
• 2015-06-18: Checked to n = 5000000, Thomas Ritschel
• 2015-01-04: Checked to n = 4500000, Thomas Ritschel
• 2012-12-05: Found n = 4203426, Thomas Ritschel
• 2012-04-02: Checked to n = 4200000, Thomas Ritschel
• 2012-01-02: Checked to n = 4100000, Thomas Ritschel
• 2011-12-01: Checked to n = 4080000, Thomas Ritschel
• 2011-10-31: Checked to n = 4050000, Thomas Ritschel
• 2011-09-20: Checked to n = 4000000, Thomas Ritschel
• 2011-08-16: Checked to n = 3800000, Thomas Ritschel
• 2011-07-12: Checked to n = 3600000, Thomas Ritschel
• 2011-06-08: Checked to n = 3400000, Thomas Ritschel
• 2011-05-07: Checked to n = 3200000, Thomas Ritschel
• 2011-04-05: Checked to n = 3000000, Thomas Ritschel
• 2011-03-07: Checked to n = 2000000, Thomas Ritschel
• 2011-02-04: Reserved by Thomas Ritschel from n=1000000
• 2009-07-30: Reserved by Borys Jaworski for sieving only n=1000000-5000000
• 2008-08-28: Reserved by Carlos Eduardo Pinho
• 2007-01-02: Checked to n = 1000000, Thomas Ritschel, released
• 2006-12-24: Reserved by Thomas Ritschel for n=500000-1000000
• 2006-02-27: Checked to n = 500000, Thomas Ritschel, released
• 2006-02-06: Checked to n = 400000, Thomas Ritschel
• 2006-02-02: Reserved by Thomas Ritschel
• 2004?: Checked to n = 270000, Jocelyn Larouche ??
• 2004-08-18: Found n = 240802, Jocelyn Larouche
• 2004-08-16: Reserved by Jocelyn Larouche for n≤1000000
• 2004-04-29: Checked to n<200000, Jocelyn Larouche
• 2004-04-29: Reserved by Thomas Masser
• 1998-08-06: Found n = 59770, Wilfrid Keller