Riesel primes of the form 649•2n-1

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

Current data

k , b : 649 , 2 Count : 52 Nash : 2498 Max n : 2,170,000 Date : 2024-04-02 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 7, 9, 13, 25, 39, 51, 69, 173, 217, 319, 605, 609, 621, 629, 1105, 1467, 1473, 1831, 4011, 5049, 5767, 6985, 11683, 13021, 15307, 16953, 18559, 27719, 33083, 55561, 62991, 63513, 71943, 74481, 138563, 155503, 169969, 194265, 203961, 218029, 363553, 389571, 476415, 652103, 679239, 703917, 760895, 804991, 868233, 1172271, 1551271

History

• 2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
• 2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
• 2019-12-19: Found n = 1551271, Gary Barnes
• 2012-05-06: Found n = 1172271, Brian Lody
• 2011-12-31: Reserved by NPLB Drive 14, for 1000000<n<=2000000
• 2011-02-08: Checked to n = 1000000, NPLB Drive 6, released
• 2010-12-24: Found n = 868233, Brian Lody
• 2010-11-14: Found n = 804991, Vaughan Davies
• 2010-09-29: Found n = 760895, Gary Barnes
• 2009-07-30: Found n = 703917, Vaughan Davies
• 2009-05-18: Found n = 679239, Gary Barnes
• 2009-05-06: Found n = 652103, David James
• 2008-12-22: Checked to n = 600000, NPLB Drive 1, released
• 2008-12-19: Reserved by NPLB Drive 6, for 600000<n<=1000000
• 2008-07-09: Found n = 476415, Bruce E. Slade
• 2008-03-25: Checked to n = 333200, NPLB Drive 2, released
• 2008-03-19: Found n = 389571, James P. Burt
• 2008-02-22: Found n = 363553, Gary Barnes
• 2008-01-22: Reserved by NPLB Drive 2, for 260000<=n<=333200
• 2008-01-21: Reserved by NPLB Drive 1, for 333201<=n<=600000
• 2004-10-21: Found n = 218029, Steven Harvey
• 2004-10-20: Found n = 203961, Steven Harvey
• 2004-10-19: Found n = 194265, Steven Harvey