Riesel primes of the form 55•2n-1

Current data

k , b : 55 , 2 Count : 57 Nash : 2113 Max n : 3,520,000 Date : 2024-05-07

1, 3, 5, 7, 15, 33, 41, 57, 69, 75, 77, 131, 133, 153, 247, 305, 351, 409, 471, 1251, 1259, 2253, 2411, 2425, 2699, 3221, 4099, 4173, 4291, 4905, 5349, 6723, 7143, 7505, 10539, 10557, 12099, 17373, 23721, 27895, 33801, 35519, 45927, 63589, 73287, 96933, 106659, 218043, 253047, 397941, 651015, 1075711, 1162155, 1406997, 1468439, 1729777, 2084305

History

• 2024-05-07: Reservation dropped, William Byerly
• 2021-10-22: Checked to n = 3520000, William Byerly
• 2021-09-09: Checked to n = 3450000, William Byerly
• 2021-07-14: Checked to n = 3040000, William Byerly
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2021-02-18: Checked to n = 2400000, William Byerly
• 2021-02-10: Found n = 2084305, William Byerly
• 2021-02-06: Checked to n = 2200000, William Byerly
• 2017-07-27: Reserved by William Byerly
• 2014-10-05: Checked to n = 2060000, Predrag Minovic, released
• 2013-12-08: Checked to n = 2000000, Predrag Minovic
• 2013-09-08: Checked to n = 1920000, Predrag Minovic
• 2013-07-09: Checked to n = 1830000, Predrag Minovic
• 2013-05-10: Found n = 1729777, Predrag Minovic
• 2013-02-07: Found n = 1468439, Predrag Minovic
• 2012-12-27: Reserved by Predrag Minovic from n=1410000
• 2011-01-13: Checked to n = 1410000, Borys Jaworski, released
• 2011-01-13: Found n = 1406997, Borys Jaworski
• 2011-01-03: Checked to n = 1380000, Borys Jaworski
• 2010-11-30: Checked to n = 1320000, Borys Jaworski
• 2010-11-19: Reserved by Borys Jaworski from n=1300000
• 2008-03-27: Found n = 1162155, Mark Anderson
• 2008-03-21: Found n = 1075711, Mark Anderson
• 2008-02-24: Checked to n = 946000, Chris Chatfield
• 2007-12-09: Checked to n = 929000, Chris Chatfield
• 2007-07-16: Checked to n = 900000, Chris Chatfield
• 2007-07-16: Checked to n = 800000, Chris Chatfield
• 2007-06-05: Found n = 651015, Chris Chatfield
• 2005-02-10: Found n = 397941, Predrag Minovic
• 2004-11-07: Found n = 253047, Predrag Minovic
• 2004-11-04: Found n = 218043, Predrag Minovic
• 1999-06-30: Found n = 96933, Dale Andrews
• 1999-06-08: Found n = 73287, Dale Andrews
• 1999-05-31: Found n = 63589, Dale Andrews
• 1999-05-16: Found n = 45927, Dale Andrews
• 1999-04-14: Found n = 35519, Dale Andrews
• 1999-04-14: Found n = 33801, Dale Andrews
• 1999-04-13: Found n = 27895, Dale Andrews
• 1994: Found n = 7505, Harvey Dubner
• 1994: Found n = 7143, Harvey Dubner
• 1994: Found n = 6723, Harvey Dubner