Riesel primes of the form 689•2n-1

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

Current data

k , b : 689 , {{{Rb}}} Count : 21 Nash : 1038 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

8, 12, 100, 104, 440, 656, 864, 2840, 13416, 16532, 19980, 21220, 62024, 79224, 126120, 250036, 460772, 875428, 893028, 1204032, 1512316

[[Category:Riesel {{{Rb}}}|#.....00689]]

History

• 2018-06-05: Found n = 1512316, Max Dettweiler
• 2012-06-24: Found n = 1204032, Brian Lody
• 2011-12-31: Reserved by NPLB Drive 14, for 1000000<n<=2000000
• 2011-02-08: Checked to n = 1000000, NPLB Drive 6, released
• 2011-01-03: Found n = 893028, Brian Lody
• 2010-12-30: Found n = 875428, Ricky L. Hubbard
• 2008-12-22: Checked to n = 600000, NPLB Drive 1, released
• 2008-12-19: Reserved by NPLB Drive 6, for 600000<n<=1000000
• 2008-06-16: Found n = 460772, 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
• 2005-10-13: Found n = 250036, Steven Harvey
• 2003-08-13: Found n = 126120, Steven Harvey
• 2001-07-01: Found n = 79224, Kimmo Herranen