Riesel primes of the form 331•2n-1

Reserved! This sequence is currently part of Multi Reservation 26: NPLB Drive 19.

Current data

k , b : 331 , 2 Type : Low Count : 17 Nash : 601 Max n : 3,100,000 Date : 2024-08-15 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 3, 9, 25, 639, 3171, 4017, 9561, 13539, 30169, 55953, 184393, 242145, 389727, 575199, 600339, 913201

History

• 2023-03-07: Reserved by NPLB Drive 19, for 3000000<n<4000000
• 2022-06-03: Checked to n = 3000000, NPLB Drive 15, released
• 2014-12-29: Reserved by NPLB Drive 15, for n=2000000-3000000
• 2013-10-22: Checked to n = 2000000, Karsten Bonath, released
• 2013-02-25: Reserved by Karsten Bonath, for 1300000<n<2000000
• 2012-10-10: Checked to n = 1300000, Gary Barnes, released
• 2012-09-25: Reserved by Gary Barnes, for 1000000<n<1300000
• 2008-11-10: Checked to n = 600000, NPLB Drive 3, released
• 2008-11-05: 575199 confirmed, Chris Chatfield
• 2008-10-13: Checked to n = 1000000, Carlos Eduardo Pinho, released, results not available anymore
• 2008-10-11: Found n = 913201, Carlos Eduardo Pinho
• 2008-08-21: Checked n = 800000 - 850000, Carlos Eduardo Pinho, results included
• 2008-08-18: Checked n = 700000 - 800000, Carlos Eduardo Pinho, results included
• 2008-07-20: Checked n = 850000 - 900000, Carlos Eduardo Pinho, results included
• 2008-07-20: Checked to n = 700000, Carlos Eduardo Pinho, results included
• 2008-07-18: Checked to n = 672000, Carlos Eduardo Pinho, also n=850000-879000
• 2008-06-17: Checked to n = 642000, Carlos Eduardo Pinho
• 2008-05-17: Found n = 600339, Carlos Eduardo Pinho
• 2008-05-09: Reserved by Carlos Eduardo Pinho, for 600000<n<1000000
• 2008-03-01: Reserved by NPLB Drive 3, for 260000<n<600000
• 2007-06-15: Found n = 575199, James S. Griffin
• 2007-05-17: Found n = 389727, James S. Griffin
• 2005-09-28: Found n = 242145, James S. Griffin
• 2004-10-03: Found n = 184393, Steven Harvey