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 n = 3450000 - 3520000, William Byerly
• 2021-09-09: Checked n = 3040000 - 3450000, William Byerly
• 2021-07-14: Checked n = 2400000 - 3040000, William Byerly
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2021-02-18: Checked n = 2200000 - 2400000, William Byerly
• 2021-02-11: Found n = 2084305, William Byerly
• 2021-02-06: Checked n = 2060000 - 2200000, William Byerly
• 2017-07-27: Reserved by William Byerly
• 2014-10-05: Checked n = 2000000 - 2060000, Predrag Minovic, released
• 2013-12-08: Checked n = 1920000 - 2000000, Predrag Minovic
• 2013-09-08: Checked n = 1830000 - 1920000, Predrag Minovic
• 2013-07-09: Checked n = 1410000 - 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 n = 1380000 - 1410000, Borys Jaworski, released
• 2011-01-13: Found n = 1406997, Borys Jaworski
• 2011-01-03: Checked n = 1320000 - 1380000, Borys Jaworski
• 2010-11-30: Checked n = 1300000 - 1320000, Borys Jaworski
• 2010-11-19: Reserved by Borys Jaworski from n = 1300000
• 2009-07-26: Checked to n = 1300000, (unknown), See limit at RPS other completed ranges.
• 2009-01-09: Checked n = 950000 - 992234, 1652055 - 1681825, Peter Benson
• 2008-03-27: Found n = 1162155, Mark Anderson
• 2008-03-21: Found n = 1075711, Mark Anderson
• 2008-02-24: Checked n = 929000 - 946000, Chris Chatfield, released
• 2007-12-09: Checked n = 900000 - 929000, Chris Chatfield
• 2007-09-17: Checked n = 800000 - 900000, Chris Chatfield
• 2007-07-16: Checked n = 700000 - 800000, Chris Chatfield
• 2007-06-14: Checked n = 600000 - 700000, Chris Chatfield
• 2007-06-05: Found n = 651015, Chris Chatfield
• 2007-05-21: Checked n = 520000 - 600000, Chris Chatfield
• 2007-04-21: Reserved by Chris Chatfield from n = 520000
• 2006-03-23: Checked n = 120000 - 200000, Thomas Ritschel, double-check
• 2005-06-15: Checked n = 430000 - 520000, Predrag Minovic, released
• 2005-03-22: Checked n = 400000 - 430000, Predrag Minovic
• 2005-02-13: Checked n = 350000 - 400000, Predrag Minovic
• 2005-02-10: Found n = 397941, Predrag Minovic
• 2004-12-30: Checked n = 280000 - 350000, Predrag Minovic
• 2004-12-04: Checked n = 220000 - 280000, Predrag Minovic
• 2004-11-07: Found n = 253047, Predrag Minovic
• 2004-11-05: Checked n = 210000 - 220000, Predrag Minovic
• 2004-11-05: Found n = 218043, Predrag Minovic
• 2004-11-05: Reserved by Predrag Minovic
• 2004-08-01: Checked n = 200000 - 210000, Steven Harvey, released
• 2004-07-26: Reserved by Steven Harvey for n = 200000 - 210000
• 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