Riesel primes of the form 8235•2n-1

Current data

k , b : 8235 , 2 Type : 315 Count : 87 Nash : 4380 Max n : 700,000 Date : 2025-05-04

2, 4, 5, 8, 12, 20, 21, 25, 27, 28, 32, 46, 48, 54, 58, 80, 84, 100, 128, 224, 232, 254, 260, 261, 288, 416, 450, 567, 612, 718, 860, 982, 1118, 1174, 1286, 1427, 1658, 1968, 2206, 2322, 2344, 2456, 2905, 3805, 4794, 5355, 5476, 6384, 6608, 6936, 7116, 7140, 14840, 16686, 21221, 22496, 24689, 30882, 31256, 41904, 45476, 61320, 65368, 69248, 73369, 96897, 96989, 110928, 122967, 132769, 153570, 176267, 198431, 244322, 262126, 276645, 278588, 285152, 342890, 350525, 389465, 397032, 409645, 483521, 531486, 585037, 698748

History

• 2025-05-04: Checked n = 10000 - 700000, Gary Barnes, double-check n = 10000 - 20000 & n = 350000 - 433000, released
• 2010-02-01: Found n = 698748, Ian M. Gunn
• 2009-08-08: Found n = 585037, Ian M. Gunn
• 2009-07-09: Found n = 531486, Ian M. Gunn
• 2009-05-13: Found n = 483521, Ian M. Gunn
• 2009-04-10: Checked n = 350000 - 433000, Ian M. Gunn
• 2009-04-10: Found n = 350525, Ian M. Gunn
• 2009-04-06: Checked n = 380000 - 405000, RPS Drive 8, released, see ending n-value here.
• 2009-04-01: Found n = 409645, Ian M. Gunn
• 2009-03-31: 389465 confirmed, Predrag Minovic, RPS Drive 8
• 2009-03-28: Found n = 397032, Peter Riesen, RPS Drive 8
• 2009-03-27: Found n = 389465, Ian M. Gunn
• 2009-03-24: Reserved by RPS Drive 8, for n = 380000 - 700000
• 2009-02-19: Reserved by Ian M. Gunn to n = 1000000
• 2009-01-13: Checked n = 10000 - 20000, Karsten Bonath
• 2007-07-06: Checked n = 1 - 10000, Gary Barnes