Riesel primes of the form 961•2n-1

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

Current data

k , b : 961 , 2 Count : 27 Nash : 1515 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

3, 7, 45, 607, 631, 1107, 1363, 4045, 4965, 5107, 6123, 12613, 13251, 13429, 15115, 15525, 25671, 43357, 106141, 168691, 215859, 224707, 381943, 726835, 752991, 849471, 906211

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
• 2011-07-11: Checked to n = 1000000, NPLB Drive 7, released
• 2011-04-11: Found n = 906211, Lennart Vogel
• 2011-04-05: Found n = 849471, Lennart Vogel
• 2010-03-10: Found n = 752991, Karsten Bonath
• 2009-10-17: Found n = 726835, Ian M. Gunn
• 2008-12-22: Checked to n = 600000, NPLB Drive 1, released
• 2008-12-19: Reserved by NPLB Drive 7, for 600000<n<=1000000
• 2008-03-25: Checked to n = 333200, NPLB Drive 2, released
• 2008-03-16: Found n = 381943, James P. Burt
• 2008-01-22: Reserved by NPLB Drive 2, for 260000<=n<=333200
• 2008-01-21: Reserved by NPLB Drive 1, for 333201<=n<=600000
• 2004-12-22: Found n = 224707, Peter Benson
• 2004-12-21: Found n = 215859, Peter Benson
• 2003-01-14: Found n = 106141, Steven Harvey