Riesel primes of the form 727•2n-1

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

Current data

k , b : 727 , 2 Count : 28 Nash : 1361 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 9, 13, 21, 29, 101, 125, 153, 209, 445, 525, 613, 741, 1645, 10173, 12817, 13629, 59361, 74769, 87501, 121241, 172397, 221325, 369081, 658245, 1018709, 1031225, 1958505

History

• 2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
• 2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
• 2023-01-14: Found n = 1958505, Max Dettweiler
• 2012-02-22: Found n = 1031225, Lennart Vogel
• 2012-02-20: Found n = 1018709, Lennart Vogel
• 2011-12-31: Reserved by NPLB Drive 14, for 1000000<n<=2000000
• 2011-02-08: Checked to n = 1000000, NPLB Drive 6, released
• 2009-05-08: Found n = 658245, Gary Barnes
• 2008-12-22: Checked to n = 600000, NPLB Drive 1, released
• 2008-12-19: Reserved by NPLB Drive 6, for 600000<n<=1000000
• 2008-03-25: Checked to n = 333200, NPLB Drive 2, released
• 2008-03-01: Found n = 369081, Gary Barnes
• 2008-01-22: Reserved by NPLB Drive 2, for 260000<=n<=333200
• 2008-01-21: Reserved by NPLB Drive 1, for 333201<=n<=600000
• 2004-12-29: Found n = 221325, Jay Berg
• 2004-09-13: Found n = 172397, Steven Harvey
• 2003-08-26: Found n = 121241, Steven Harvey