Riesel primes of the form 623•2n-1

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

Current data

k , b : 623 , 2 Count : 41 Nash : 2051 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

4, 16, 26, 34, 58, 84, 86, 132, 152, 206, 220, 352, 664, 748, 1004, 1504, 1584, 2006, 3472, 3548, 3724, 5588, 6134, 8890, 8936, 9572, 10838, 12508, 12900, 13872, 59744, 94964, 108826, 213682, 217826, 225340, 425422, 563618, 1445836, 1635956, 1787546

History

• 2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
• 2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
• 2022-08-17: Found n = 1787546, Gary Barnes
• 2021-10-29: Found n = 1635956, William Byerly
• 2016-11-29: Found n = 1445836, Max Dettweiler
• 2011-12-31: Reserved by NPLB Drive 14, for 1000000<n<=2000000
• 2011-02-08: Checked to n = 1000000, NPLB Drive 6, released
• 2008-12-22: Checked to n = 600000, NPLB Drive 1, released
• 2008-12-19: Reserved by NPLB Drive 6, for 600000<n<=1000000
• 2008-12-02: Found n = 563618, Gary Barnes
• 2008-05-08: Found n = 425422, Chris Chatfield
• 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
• 2004-12-18: Found n = 225340, Steven Harvey
• 2004-12-18: Found n = 217826, Steven Harvey
• 2004-12-18: Found n = 213682, Steven Harvey
• 2002-12-09: Found n = 108826, Steven Harvey
• 2002-02-13: Found n = 94964, Kimmo Herranen