Riesel primes of the form 6783•2n-1

Current data

k , b : 6783 , 2 Type : 3 Count : 55 Nash : 3462 Max n : 1,000,000 Date : 2025-06-17

6, 12, 15, 16, 22, 31, 58, 60, 70, 71, 76, 147, 156, 208, 215, 280, 294, 351, 370, 435, 455, 474, 510, 655, 687, 736, 930, 1816, 3192, 3828, 5806, 13731, 23394, 26071, 28260, 29520, 45471, 49911, 58135, 76335, 100666, 118179, 181727, 188020, 203087, 237607, 261858, 310240, 339836, 379756, 532139, 651282, 764607, 853959, 990092

History

• 2025-06-17: Checked n = 10000 - 1000000, Gary Barnes, double-check n = 410000 - 485000, n = 490000 - 560000 & n = 700000 - 1000000, released
• 2015-12-05: Checked n = 800000 - 1000000?, Free-DC Drive Mid-weight, suspended
• 2014-11-10: Found n = 990092, (Telnaior), Free-DC Drive Mid-weight
• 2012-05-17: Found n = 853959, David Nicol, Free-DC Drive Mid-weight
• 2011-05-01: Reserved by Free-DC Drive Mid-weight from n = 800000
• 2011-01-29: Checked n = 700000 - 800000?, Free-DC Drive High-weight, suspended
• 2011-01-13: Found n = 764607, Brian Lody, Free-DC Drive High-weight
• 2010-12-12: Reserved by Free-DC Drive High-weight from n = 700000
• 2010-06-06: Checked n = 410000 - 485000, 490000 - 560000?, Free-DC Drive 2, suspended
• 2010-05-30: Found n = 532139, James P. Burt, Free-DC Drive 2
• 2009-05-28: Reserved by Free-DC Drive 2 from n = 410000
• 2007-07-06: Checked n = 1 - 10000, Gary Barnes