Riesel primes of the form 875•2n-1

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

Current data

k , b : 875 , 2 Count : 54 Nash : 2311 Max n : 2,200,000 Date : 2024-07-30 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

2, 4, 8, 12, 20, 24, 32, 56, 76, 84, 98, 148, 170, 208, 212, 222, 278, 318, 356, 400, 500, 644, 672, 680, 786, 830, 2212, 2238, 3180, 3326, 5160, 7970, 8688, 9770, 10176, 38820, 43140, 49442, 138818, 166170, 170282, 196208, 268574, 301010, 448648, 450848, 511928, 663162, 695742, 757362, 954840, 1132454, 1283164, 1340454

History

• 2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
• 2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
• 2014-09-14: Found n = 1340454, Lennart Vogel
• 2014-01-03: Found n = 1283164, Gary Barnes
• 2012-04-20: Found n = 1132454, Göran Schmidt
• 2011-12-31: Reserved by NPLB Drive 14, for 1000000<n<=2000000
• 2011-07-11: Checked to n = 1000000, NPLB Drive 7, released
• 2011-06-01: Found n = 954840, Vaughan Davies
• 2010-03-29: Found n = 757362, Karsten Bonath
• 2009-06-19: Found n = 695742, Ian M. Gunn
• 2009-04-04: Found n = 663162, 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
• 2008-07-28: Found n = 511928, Gary Barnes
• 2008-05-30: Found n = 450848, Glenn C. Kaiser
• 2008-05-25: Found n = 448648, Glenn C. Kaiser
• 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
• 2005-01-02: Found n = 196208, Steven Harvey
• 2004-08-16: Found n = 170282, Steven Harvey
• 2003-11-17: Found n = 138818, Steven Harvey