Riesel primes of the form 631•2n-1

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

Current data

k , b : 631 , 2 Type : Low Count : 26 Nash : 946 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

17, 91, 131, 161, 227, 923, 1243, 2921, 3835, 6187, 13259, 33473, 37217, 41117, 45197, 51353, 70373, 80657, 84787, 101443, 166411, 170153, 238781, 462929, 1228421, 6359347

History

• 2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
• 2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
• 2021-07-17: Found n = 6359347, Ryan Propper
• 2012-09-10: Found n = 1228421, Max Dettweiler
• 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
• 2008-06-22: Found n = 462929, Karsten Bonath
• 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
• 2004-10-15: Found n = 238781, Steven Harvey
• 2002-12-10: Found n = 101443, Steven Harvey