Riesel primes of the form 781•2n-1

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

Current data

k , b : 781 , {{{Rb}}} Count : 25 Nash : 1567 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

3, 9, 27, 29, 45, 221, 315, 381, 875, 1175, 1773, 2223, 20907, 21465, 21525, 58665, 63537, 88925, 114681, 118085, 204887, 254331, 320757, 978597, 1378671

[[Category:Riesel {{{Rb}}}|#.....00781]]

History

• 2014-11-25: Found n = 1378671, 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
• 2011-01-12: Found n = 978597, Brian Lody
• 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
• 2008-01-22: Reserved by NPLB Drive 2, for 260000<=n<=333200
• 2008-01-21: Reserved by NPLB Drive 1, for 333201<=n<=600000
• 2005-10-27: Found n = 254331, Steven Harvey
• 2005-02-03: Found n = 204887, Steven Harvey
• 2003-04-30: Found n = 118085, Steven Harvey
• 2003-04-30: Found n = 114681, Steven Harvey