Riesel primes of the form 931•2n-1

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

Current data

k , b : 931 , 2 Count : 25 Nash : 1395 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 27, 59, 109, 169, 379, 1061, 1071, 1129, 3137, 3919, 4539, 10507, 11871, 17911, 19481, 24137, 28729, 59569, 81557, 103429, 174559, 196069, 568391, 2222099

History

• 2024-10-16: Found n = 2222099, Göran Schmidt, NPLB Drive 18
• 2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
• 2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
• 2011-12-31: Reserved by NPLB Drive 14, for 1000000<n<=2000000
• 2011-07-11: Checked to n = 1000000, NPLB Drive 7, released
• 2008-12-22: Checked to n = 600000, NPLB Drive 1, released
• 2008-12-19: Reserved by NPLB Drive 7, for 600000<n<=1000000
• 2008-11-22: Found n = 568391, Gary Barnes
• 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
• 2005-01-08: Found n = 196069, Patrick Keller
• 2004-09-21: Found n = 174559, Steven Harvey
• 2003-01-08: Found n = 103429, Steven Harvey
• 2001-06-30: Found n = 81557, Kimmo Herranen