Riesel primes of the form 209•2n-1

Reserved! This sequence is currently part of Multi Reservation 7: NPLB K300 Drive 1.

Current data

k , b : 209 , 2 Type : Low Count : 18 Nash : 998 Max n : 2,800,000 Date : 2024-11-13 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

4, 8, 16, 28, 40, 52, 80, 148, 328, 8464, 11704, 52372, 60172, 675232, 692692, 921484, 1207276, 1647640

History

• 2024-04-23: Reserved by NPLB K300 Drive 1 for n > 2000000
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2013-01-12: Checked to n = 2000000, James P. Burt
• 2012-05-31: Checked to n = 1830000, James P. Burt
• 2012-01-06: Found n = 1647640, James P. Burt
• 2011-04-29: Checked to n = 1300000, James P. Burt
• 2011-04-28: Found n = 1207276, James P. Burt
• 2011-04-26: Reserved by James P. Burt
• 2009-07-30: Reserved by Borys Jaworski for sieving only n=1000000-5000000
• 2008-10-23: Checked to n = 1000000, Karsten Bonath, released
• 2008-09-15: Found n = 921484, Karsten Bonath
• 2008-09-01: Checked to n = 886000, Karsten Bonath
• 2008-06-03: Checked to n = 870000, Karsten Bonath
• 2007-12-26: Checked to n = 828000, Karsten Bonath
• 2007-09-10: Checked to n = 764000, Karsten Bonath
• 2007-07-09: Checked to n = 704000, Karsten Bonath
• 2007-07-08: Found n = 692692, Karsten Bonath
• 2007-07-08: Found n = 675232, Karsten Bonath
• 2007-03-22: Checked to n = 653000, Karsten Bonath
• 2007-02-05: Checked to n = 577000, Karsten Bonath
• 2006-10-30: Checked to n = 476000, Karsten Bonath
• 2006-07-18: Checked to n = 431000, Karsten Bonath
• 2006-06-06: Checked to n = 382000, Karsten Bonath
• 2006-06-06: Reserved by Karsten Bonath
• 2004?: Checked to n = 250000, Mark Anderson, released
• 2004-06-04: Reserved by Mark Anderson, for n ≤ 250000
• 2000-09-25: Found n = 60172, Tom Kuechler
• 2000-09-11: Found n = 52372, Tom Kuechler