Riesel primes of the form 921•2n-1

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

Current data

k , b : 921 , 2 Type : 3 Count : 47 Nash : 1837 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

6, 15, 59, 62, 69, 71, 90, 138, 171, 186, 383, 410, 578, 582, 734, 854, 1746, 1770, 1905, 1950, 2793, 3822, 4050, 4166, 4382, 5603, 5850, 7785, 8463, 19190, 22851, 47439, 47975, 57218, 58103, 58818, 62121, 108443, 184190, 483762, 589470, 647991, 866334, 1006898, 1178279, 1966634, 2030231

History

• 2023-03-10: Found n = 2030231, Max Dettweiler
• 2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
• 2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
• 2023-01-15: Found n = 1966634, Max Dettweiler
• 2012-05-15: Found n = 1178279, Brian Lody
• 2012-02-17: Found n = 1006898, Gary Barnes
• 2011-12-31: Reserved by NPLB Drive 14, for 1000000<n<=2000000
• 2011-07-11: Checked to n = 1000000, NPLB Drive 7, released
• 2011-04-07: Found n = 866334, Max Dettweiler
• 2009-03-04: Found n = 647991, Ian M. Gunn
• 2008-12-22: Checked to n = 600000, NPLB Drive 1, released
• 2008-12-19: Reserved by NPLB Drive 7, for 600000<n<=1000000
• 2008-12-13: Found n = 589470, David James
• 2008-07-05: Found n = 483762, Gary Barnes
• 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
• 2004-09-20: Found n = 184190, Steven Harvey
• 2003-01-07: Found n = 108443, Steven Harvey