Riesel primes of the form 417•2n-1

Reserved! This sequence is currently part of Multi Reservation 8: NPLB Drive 17.

Current data

k , b : 417 , 2 Type : 3 Count : 40 Nash : 1761 Max n : 2,820,000 Date : 2024-03-09 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

2, 6, 8, 53, 62, 68, 86, 92, 98, 126, 173, 194, 330, 332, 356, 380, 789, 3746, 3990, 4004, 4142, 4940, 9629, 10346, 10749, 15882, 15992, 17126, 18128, 31118, 138542, 239829, 275270, 278058, 295941, 319430, 536876, 667878, 991349, 1155458

History

• 2022-08-10: Checked to n = 2000000, NPLB Drive 13, released
• 2022-08-09: Reserved by NPLB Drive 17, for 2000000<n<3000000
• 2012-09-27: Found n = 1155458, Lennart Vogel
• 2011-08-04: Reserved by NPLB Drive 13, for 1000000<n<2000000
• 2010-11-11: Checked to n = 1000000, NPLB Drive 5
• 2010-11-05: Found n = 991349, Chris Chatfield
• 2009-04-30: Found n = 667878, Vaughan Davies
• 2008-12-22: Checked to n = 600000, NPLB Drive 1
• 2008-12-19: Reserved by NPLB Drive 5, for 600000<n<1000000
• 2008-10-26: 536876 confirmed, Gary Barnes
• 2008-03-25: Checked to n = 333200, NPLB Drive 2
• 2008-01-22: Reserved by NPLB Drive 2, for 260000<=n<=333200
• 2008-01-21: Reserved by NPLB Drive 1, for 333201<=n<=600000
• 2006-03-19: Found n = 536876, Peter O'braian
• 2005-01-13: Found n = 319430, Peter O'braian
• 2005-01-11: Found n = 295941, Peter O'braian
• 2005-01-10: Found n = 278058, Peter O'braian
• 2005-01-10: Found n = 275270, Peter O'braian
• 2004-10-09: Found n = 239829, Peter O'braian