Riesel primes of the form 531•2n-1

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

Current data

k , b : 531 , 2 Type : 3 Count : 41 Nash : 2117 Max n : 2,820,000 Date : 2024-03-09 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 7, 11, 15, 57, 739, 897, 1199, 1387, 1434, 1970, 2215, 2857, 2985, 4867, 5935, 10555, 11059, 15007, 20491, 22506, 23311, 42370, 56447, 63021, 69411, 91441, 115019, 184461, 198037, 292946, 319447, 366407, 367626, 374455, 403755, 621426, 807985, 836707, 1031987, 1146439

History

• 2022-08-10: Checked to n = 2000000, NPLB Drive 13, released
• 2022-08-09: Reserved by NPLB Drive 17, for 2000000<n<3000000
• 2012-09-23: Found n = 1146439, Lennart Vogel
• 2011-09-08: Found n = 1031987, Max Dettweiler
• 2011-08-04: Reserved by NPLB Drive 13, for 1000000<n<2000000
• 2010-11-11: Checked to n = 1000000, NPLB Drive 5
• 2010-06-29: Found n = 836707, Chris Chatfield
• 2010-06-04: Found n = 807985, Chris Chatfield
• 2009-01-17: Found n = 621426, Gary Barnes
• 2008-12-22: Checked to n = 600000, NPLB Drive 1
• 2008-12-19: Reserved by NPLB Drive 5, for 600000<n<1000000
• 2008-03-25: Checked to n = 333200, NPLB Drive 2
• 2008-03-11: Found n = 374455, Gary Barnes
• 2008-03-09: Found n = 403755, James P. Burt
• 2008-03-07: Found n = 366407, Carlos Eduardo Pinho
• 2008-02-28: Found n = 367626, James P. Burt
• 2008-01-22: Reserved by NPLB Drive 2, for 260000<=n<=333200
• 2008-01-21: Reserved by NPLB Drive 1, for 333201<=n<=600000
• 2004-12-02: Found n = 198037, Steven Harvey
• 2004-08-25: Found n = 184461, Steven Harvey
• 2003-03-31: Found n = 115019, Steven Harvey
• 2001-12-20: Found n = 91441, Kimmo Herranen
• 1998-10-23: Found n = 23311, Christ van Willegen
• 1998-10-23: Found n = 22506, Christ van Willegen
• 1998-10-23: Found n = 20491, Christ van Willegen