Riesel primes of the form 721•2n-1

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

Current data

k , b : 721 , 2 Type : Low Count : 23 Nash : 904 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

5, 23, 33, 119, 335, 445, 989, 1509, 1535, 1599, 1925, 2105, 18185, 26605, 41519, 83225, 98565, 130333, 132999, 141693, 180409, 835013, 946433

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
• 2011-02-08: Checked to n = 1000000, NPLB Drive 6, released
• 2011-01-08: Found n = 946433, Brian Lody
• 2010-11-25: Found n = 835013, 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
• 2004-09-13: Found n = 180409, Steven Harvey
• 2002-03-10: Found n = 98565, Kimmo Herranen