Riesel primes of the form 981•2n-1

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

Current data

k , b : 981 , 2 Type : 3 Count : 38 Nash : 1742 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

2, 5, 17, 23, 34, 62, 77, 95, 170, 185, 205, 215, 262, 322, 446, 605, 755, 1667, 3005, 3722, 6242, 8845, 16787, 34775, 51857, 65963, 71594, 91427, 95147, 100523, 111461, 188717, 570197, 708677, 904438, 1658111, 1859266, 2104657

History

• 2023-04-17: Found n = 2104657, 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
• 2022-12-14: Found n = 1859266, Max Dettweiler
• 2022-02-05: Found n = 1658111, 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
• 2011-04-11: Found n = 904438, Chris Chatfield
• 2009-08-14: Found n = 708677, 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
• 2008-11-18: Found n = 570197, Max Dettweiler
• 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
• 2004-10-13: Found n = 188717, Peter Benson
• 2003-05-22: Found n = 111461, Steven Harvey