Riesel primes of the form 681•2n-1

Reserved! This sequence is currently part of Multi Reservation 3: NPLB Drive 18.

Current data

k , b : 681 , 2 Type : 3 Count : 35 Nash : 1986 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 9, 31, 90, 114, 129, 138, 261, 349, 369, 451, 522, 874, 1042, 1314, 2934, 3729, 4737, 6870, 7398, 18313, 19818, 38587, 40218, 54850, 56133, 66102, 80073, 135081, 192109, 239410, 254947, 316819, 460099, 466063

History

• 2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
• 2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
• 2011-12-31: Reserved by NPLB Drive 14, for 1000000<n<=2000000
• 2011-02-08: Checked to n = 1000000, NPLB Drive 6, released
• 2008-12-22: Checked to n = 600000, NPLB Drive 1, released
• 2008-12-19: Reserved by NPLB Drive 6, for 600000<n<=1000000
• 2008-06-11: Found n = 460099, Karsten Bonath
• 2008-06-01: Found n = 466063, James P. Burt
• 2008-03-25: Checked to n = 333200, NPLB Drive 2, released
• 2008-01-22: Reserved by NPLB Drive 2, for 260000<=n<=333200
• 2008-01-21: Reserved by NPLB Drive 1, for 333201<=n<=600000
• 2006-02-12: Found n = 254947, Steven Harvey
• 2006-02-10: Found n = 239410, Steven Harvey
• 2004-12-18: Found n = 192109, Steven Harvey
• 1998-12-17: Found n = 66102, Edwin Mons
• 1998-11-27: Found n = 56133, Edwin Mons
• 1998-11-27: Found n = 54850, Edwin Mons
• 1998-06-02: Found n = 38587, David Hanson