Riesel primes of the form 993•2n-1

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

Current data

k , b : 993 , 2 Type : 3 Count : 39 Nash : 2092 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

4, 7, 8, 14, 18, 66, 144, 206, 244, 283, 286, 511, 671, 766, 918, 1211, 2166, 2578, 2724, 3634, 3739, 5104, 6966, 19764, 20604, 20836, 25207, 50759, 134999, 224839, 293124, 460718, 1006834, 1270944, 1384908, 1437131, 1601704, 1717566, 2221991

History

• 2024-10-15: Found n = 2221991, 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
• 2022-05-27: Found n = 1717566, Göran Schmidt
• 2021-03-30: Found n = 1601704, Gary Barnes, originally found by Max Dettweiler
• 2016-08-10: Found n = 1437131, Max Dettweiler
• 2014-12-11: Found n = 1384908, Max Dettweiler
• 2013-11-20: Found n = 1270944, Gary Barnes
• 2012-02-17: Found n = 1006834, 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
• 2008-06-15: Found n = 460718, 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
• 2004-02-20: Found n = 224839, Marcin Lipinski