Riesel primes of the form 893•2n-1

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

Current data

k , b : 893 , 2 Count : 24 Nash : 1707 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

2, 20, 48, 62, 122, 330, 350, 398, 1170, 1278, 3282, 10692, 12522, 20244, 24720, 28308, 111716, 124340, 273644, 313028, 406254, 639440, 659586, 1601408

History

• 2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
• 2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
• 2021-03-27: Found n = 1601408, Gary Barnes, originally found by 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
• 2009-03-23: Found n = 659586, Ian M. Gunn
• 2009-02-24: Found n = 639440, 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
• 2008-03-25: Checked to n = 333200, NPLB Drive 2, released
• 2008-03-11: Found n = 406254, 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
• 2003-05-12: Found n = 111716, Steven Harvey