Riesel primes of the form 687•2n-1

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

Current data

k , b : 687 , 2 Type : 3 Count : 29 Nash : 1496 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 13, 34, 37, 40, 61, 109, 128, 238, 265, 298, 550, 688, 1232, 4312, 7132, 9092, 9548, 25369, 26264, 33298, 35113, 37021, 39772, 80137, 383254, 931420, 1318064, 1823833

History

• 2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
• 2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
• 2022-10-15: Found n = 1823833, Göran Schmidt
• 2014-06-03: Found n = 1318064, Gary Barnes
• 2011-12-31: Reserved by NPLB Drive 14, for 1000000<n<=2000000
• 2011-02-08: Checked to n = 1000000, NPLB Drive 6, released
• 2011-01-06: Found n = 931420, Steve Martin
• 2008-12-22: Checked to n = 600000, NPLB Drive 1, released
• 2008-12-19: Reserved by NPLB Drive 6, for 600000<n<=1000000
• 2008-03-25: Checked to n = 333200, NPLB Drive 2, released
• 2008-03-17: Found n = 383254, 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