Riesel primes of the form 989•2n-1

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

Current data

k , b : 989 , 2 Type : Low Count : 18 Nash : 582 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

4, 16, 76, 148, 400, 652, 2788, 8212, 8308, 28216, 36796, 49396, 55780, 109828, 220384, 392020, 905968, 1418056

History

• 2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
• 2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
• 2016-01-03: Found n = 1418056, 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
• 2011-04-14: Found n = 905968, Tim Rickard
• 2008-12-22: Checked to n = 600000, NPLB Drive 1, released
• 2008-12-19: Reserved by NPLB Drive 7, for 600000<n<=1000000
• 2008-03-25: Checked to n = 333200, NPLB Drive 2, released
• 2008-02-29: Found n = 392020, Ed Goforth
• 2008-01-22: Reserved by NPLB Drive 2, for 260000<=n<=333200
• 2008-01-21: Reserved by NPLB Drive 1, for 333201<=n<=600000
• 2004-10-10: Found n = 220384, Peter Benson
• 2001-04-19: Found n = 109828, Kimmo Herranen