Riesel primes of the form 425•2n-1

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

Current data

k , b : 425 , 2 Count : 56 Nash : 2305 Max n : 2,820,000 Date : 2024-03-09 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

2, 8, 14, 20, 32, 42, 50, 62, 130, 144, 204, 262, 284, 358, 402, 420, 432, 576, 790, 886, 1472, 1798, 2148, 3440, 3992, 4568, 7740, 9614, 13916, 15262, 20430, 26558, 45828, 46500, 50194, 70764, 84458, 97700, 100558, 116194, 116966, 138038, 217116, 236076, 260930, 261562, 286772, 352328, 444896, 521696, 550026, 742506, 900176, 1016928, 1240016, 1609200

History

• 2021-05-28: Found n = 1609200, Göran Schmidt
• 2013-06-13: Found n = 1240016, Gary Barnes
• 2011-08-17: Found n = 1016928, Göran Schmidt
• 2011-08-04: Reserved by NPLB Drive 13, for 1000000<n<2000000
• 2010-11-11: Checked to n = 1000000, NPLB Drive 5
• 2010-08-30: Found n = 900176, Vaughan Davies
• 2009-12-02: Found n = 742506, Bruce E. Slade
• 2008-12-22: Checked to n = 600000, NPLB Drive 1
• 2008-12-19: Reserved by NPLB Drive 5, for 600000<n<1000000
• 2008-11-14: Found n = 550026, Ian M. Gunn
• 2008-07-07: Found n = 521696, Max Dettweiler
• 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
• 2005-10-02: Found n = 444896, Peter O'braian
• 2005-02-07: Found n = 352328, Peter O'braian
• 2005-01-24: Found n = 286772, Peter O'braian
• 2005-01-20: Found n = 261562, Peter O'braian
• 2005-01-20: Found n = 260930, Peter O'braian
• 2005-01-17: Found n = 236076, Peter O'braian
• 2005-01-16: Found n = 217116, Peter O'braian
• 2003-01-13: Found n = 138038, Dennis Okon
• 2002-12-23: Found n = 116966, Dennis Okon
• 2002-12-23: Found n = 116194, Dennis Okon
• 2002-10: Found n = 100558, Tobias Gustafsson
• 2002-03-26: Found n = 97700, Peter O'braian
• 2002-01-05: Found n = 84458, Kimmo Herranen