Riesel primes of the form 831•2n-1

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

Current data

k , b : 831 , 2 Type : 3 Count : 55 Nash : 2292 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

2, 5, 7, 9, 10, 17, 22, 23, 26, 34, 38, 85, 130, 189, 242, 269, 302, 305, 365, 647, 797, 1069, 1295, 1990, 2810, 3002, 3279, 3409, 5978, 9058, 9902, 10313, 13234, 14143, 16238, 21358, 37103, 56735, 85885, 95354, 108598, 122685, 143845, 206017, 208045, 233487, 314002, 367702, 419018, 471566, 490927, 513082, 1386482, 2070622, 2226903

History

• 2024-11-01: Found n = 2226903, Göran Schmidt, NPLB Drive 18
• 2023-03-20: Found n = 2070622, Oliver Kruse, NPLB Drive 18
• 2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
• 2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
• 2015-01-01: Found n = 1386482, Gary Barnes, originally found by Max Dettweiler
• 2011-12-31: Reserved by NPLB Drive 14, for 1000000<n<=2000000
• 2011-07-11: Checked to n = 1000000, NPLB Drive 7, released
• 2008-12-22: Checked to n = 600000, NPLB Drive 1, released
• 2008-12-19: Reserved by NPLB Drive 7, for 600000<n<=1000000
• 2008-07-31: Found n = 513082, Gary Barnes
• 2008-06-24: Found n = 490927, James P. Burt
• 2008-06-06: Found n = 471566, James P. Burt
• 2008-04-23: Found n = 419018, Adam Sutton
• 2008-03-25: Checked to n = 333200, NPLB Drive 2, released
• 2008-02-29: Found n = 367702, James P. Burt
• 2008-01-22: Reserved by NPLB Drive 2, for 260000<=n<=333200
• 2008-01-21: Reserved by NPLB Drive 1, for 333201<=n<=600000
• 2005-09-25: Found n = 233487, Valerie Vonck
• 2005-02-24: Found n = 208045, Steven Harvey
• 2005-02-24: Found n = 206017, Steven Harvey
• 2002-11-10: Found n = 108598, Steven Harvey
• 2002-01-15: Found n = 95354, Andrew J. Rupinski
• 2002-01-14: Found n = 85885, Andrew J. Rupinski