Riesel primes of the form 229•2n-1

Current data

k , b : 229 , 2 Count : 50 Nash : 2195 Max n : 3,000,000 Date : 2024-04-23

1, 3, 7, 19, 25, 27, 71, 97, 231, 235, 291, 295, 313, 347, 491, 511, 531, 571, 803, 1499, 1523, 1607, 1743, 2161, 2231, 3113, 5511, 5863, 6039, 8055, 8443, 9707, 12155, 12195, 21049, 24271, 34403, 34879, 56491, 58839, 162583, 207863, 220147, 560259, 586795, 715459, 969073, 1670843, 2331017, 2581111

History

• 2024-04-23: Reservation dropped, Michael Curtis
• 2023-07-17: Checked to n = 3000000, Michael Curtis
• 2021-10-22: Found n = 2331017, Michael Curtis
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2020-03-13: Restarted, Michael Curtis
• 2017-12-18: Found n = 2581111, Michael Curtis
• 2016-01-03: Checked to n = 2000000, Michael Curtis
• 2015-06-23: Found n = 1670843, Michael Curtis
• 2015-04-01: Checked to n = 1640000, Michael Curtis
• 2014-12-24: Checked to n = 1610000, Michael Curtis
• 2014-10-05: Checked to n = 1447000, Michael Curtis
• 2013-06-11: Checked to n = 1400000, Michael Curtis
• 2013-04-07: Checked to n = 1360000, Michael Curtis
• 2013-02-02: Reserved by Michael Curtis from n=1300000
• 2012-05-14: Checked to n = 1300000, James P. Burt, released
• 2011-12-31: Checked to n = 1100000, James P. Burt
• 2011-12-10: Reserved by James P. Burt from n=1000000
• 2009-07-30: Reserved by Borys Jaworski for sieving only n=1000000-5000000
• 2008-10-22: Checked to n = 1000000, NPLB Drive 4, released
• 2008-10-21: Checked to n = 1000000, Predrag Minovic
• 2008-10-08: Found n = 969073, David Metcalfe
• 2008-09-19: Found n = 715459, David Metcalfe
• 2008-09-12: Reserved by Predrag Minovic
• 2008-09-09: Reserved by NPLB Drive 4
• 2006-08-13: Checked to n = 600000, RPS Drive 2, released
• 2006-07-25: Found n = 586795, Predrag Minovic, RPS Drive 2
• 2006-07-07: Found n = 560259, David Metcalfe, RPS Drive 2
• 2006-03-18: 220147 confirmed, Alexandre de Pereyra, RPS Drive 2
• 2006-03-17: Reserved by RPS Drive 2, for n = 210000 - 600000
• 2005-08-07: Found n = 220147, Peter Benson
• 2005-01-12: Checked to n = 210000, Steven Harvey
• 2005-01-11: Found n = 207863, Steven Harvey
• 2004-07-19: Checked to n = 200000, Steven Harvey
• 2004-07-12: Reserved by Steven Harvey for n ≤ 200000