Riesel primes of the form 261•2n-1

Reserved! This sequence is currently part of Multi Reservation 7: NPLB K300 Drive 1.

Current data

k , b : 261 , 2 Type : 3 Count : 47 Nash : 2394 Max n : 2,700,000 Date : 2024-10-04 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 3, 6, 9, 21, 34, 43, 49, 114, 115, 178, 322, 411, 438, 454, 589, 598, 754, 801, 1173, 1546, 1699, 2155, 2994, 4038, 5439, 6442, 10699, 12274, 13314, 13911, 19309, 28675, 29658, 31173, 33606, 65763, 90861, 116706, 185823, 618918, 660709, 802123, 827599, 850383, 1843555, 2707551

History

• 2024-10-11: Found n = 2707551, Florian Piesker, NPLB K300 Drive 1
• 2024-04-23: Reserved by NPLB K300 Drive 1 for n > 2000000
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2013-03-08: Checked to n = 2000000, Peter Benson, released
• 2013-03-05: Found n = 1843555, Peter Benson
• 2013-03-01: Reserved by Peter Benson 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
• 2008-07-04: Checked to n = 1000000, RPS Drive 5, released
• 2007-12-20: Found n = 850383, Adam Sutton, RPS Drive 5
• 2007-12-04: Found n = 827599, David Metcalfe, RPS Drive 5
• 2007-11-15: Found n = 802123, David Metcalfe, RPS Drive 5
• 2007-06-09: Found n = 660709, Carlos Eduardo Pinho, RPS Drive 5
• 2007-05-07: Found n = 618918, Predrag Minovic, RPS Drive 5
• 2006-11-12: Reserved by RPS Drive 5, for n > 260000
• 2004-06-13: Checked to n = 200000, Robert Smith
• 2004-06-03: Reserved by Robert Smith
• 2004-05-16: Found n = 185823, Gary Chaffey
• 2003-08-04: Found n = 116706, Steven Harvey