Riesel primes of the form 643•2n-1

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

Current data

k , b : 643 , 2 Type : Low Count : 19 Nash : 719 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

47, 71, 231, 275, 323, 495, 1331, 3771, 9767, 10923, 11123, 26043, 49223, 61571, 66671, 178515, 1069859, 1377447, 1403415

History

• 2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
• 2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
• 2015-07-25: Found n = 1403415, Max Dettweiler
• 2014-11-23: Found n = 1377447, Lennart Vogel
• 2012-03-08: Found n = 1069859, 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
• 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
• 2008-01-22: Reserved by NPLB Drive 2, for 260000<=n<=333200
• 2008-01-21: Reserved by NPLB Drive 1, for 333201<=n<=600000
• 2004-09-07: Found n = 178515, Steven Harvey