Riesel primes of the form 997•2n-1

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

Current data

k , b : 997 , 2 Count : 22 Nash : 1036 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 9, 21, 29, 177, 565, 817, 1045, 1329, 4161, 4809, 5081, 6769, 7441, 42629, 74125, 183897, 217917, 426361, 438705, 1124781, 2204317

History

• 2024-08-16: Found n = 2204317, 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
• 2012-04-19: Found n = 1124781, 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
• 2008-12-22: Checked to n = 600000, NPLB Drive 1, released
• 2008-12-19: Reserved by NPLB Drive 7, for 600000<n<=1000000
• 2008-05-19: Found n = 438705, Glenn C. Kaiser
• 2008-05-06: Found n = 426361, Carlos Eduardo Pinho
• 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
• 2004-09-21: Found n = 217917, Peter Benson
• 2001-04-13: Found n = 183897, Kimmo Herranen
• 2001-04-01: Found n = 74125, Kimmo Herranen