Riesel primes of the form 639•2n-1

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

Current data

k , b : 639 , 2 Type : 3 Count : 37 Nash : 1763 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 4, 13, 15, 24, 36, 72, 91, 141, 339, 441, 657, 829, 2311, 2556, 2745, 3339, 4279, 4824, 7125, 10621, 15172, 15379, 25192, 27765, 32164, 40963, 58729, 130108, 132504, 215617, 234643, 320616, 343305, 343683, 534159, 700623

History

• 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
• 2011-02-08: Checked to n = 1000000, NPLB Drive 6, released
• 2009-07-26: Found n = 700623, Vaughan Davies
• 2008-12-22: Checked to n = 600000, NPLB Drive 1, released
• 2008-12-19: Reserved by NPLB Drive 6, for 600000<n<=1000000
• 2008-09-07: Found n = 534159, Timothy Sorbera
• 2008-03-25: Checked to n = 333200, NPLB Drive 2, released
• 2008-02-04: Found n = 343683, Carlos Eduardo Pinho
• 2008-02-04: Found n = 343305, Carlos Eduardo Pinho
• 2008-01-22: Reserved by NPLB Drive 2, for 260000<=n<=333200
• 2008-01-21: Reserved by NPLB Drive 1, for 333201<=n<=600000
• 2005-10-05: Found n = 234643, Steven Harvey
• 2004-12-18: Found n = 215617, Steven Harvey
• 1998-10-29: Found n = 40963, Christ van Willegen
• 1998-10-26: Found n = 32164, Christ van Willegen
• 1998-10-26: Found n = 27765, Christ van Willegen
• 1998-10-26: Found n = 25192, Christ van Willegen