Riesel primes of the form 61•2n-1

Reserved! This sequence is currently part of Multi Reservation 4: RPS Megabit Drive 1.

Current data

k , b : 61 , 2 Count : 55 Nash : 2170 Max n : 3,100,000 Date : 2020-11-12 Reserved : Riesel Prime SearchRiesel Prime Search/Reserved

3, 5, 9, 13, 17, 19, 25, 39, 63, 67, 75, 119, 147, 225, 419, 715, 895, 1025, 1103, 1179, 1345, 1829, 3855, 4159, 4493, 6039, 7799, 9073, 10543, 12883, 23807, 23957, 36163, 44047, 51975, 65573, 79393, 79949, 81987, 86349, 384287, 499175, 762417, 971585, 1124049, 1416365, 1487125, 1654383, 1734983, 2134577, 2381887, 2580689, 2936967, 3286535, 3366033

History

• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2018-04-11: Checked n = 1000000 - 1620000, 1674483 - 3000000, RPS Megabit Drive 1
• 2017-01-30: Found n = 2936967, Thomas Ritschel, RPS Megabit Drive 1
• 2017-01-30: Found n = 3366033, Rüdiger K. Eckhard
• 2016-06-22: Found n = 3286535, Rüdiger K. Eckhard
• 2015-11-08: Found n = 2580689, Thomas Ritschel, RPS Megabit Drive 1
• 2012-07-23: Found n = 2381887, Adam Sutton, RPS Megabit Drive 1
• 2011-11-19: Found n = 2134577, Larry Soule, RPS Megabit Drive 1
• 2011-05-11: Found n = 1734983, Larry Soule, RPS Megabit Drive 1
• 2011-03-02: Found n = 1487125, Peter Benson, RPS Megabit Drive 1
• 2011-02-13: Found n = 1416365, Larry Soule, RPS Megabit Drive 1
• 2010-11-15: Found n = 1124049, Peter Benson, RPS Megabit Drive 1
• 2010-10-24: Reserved by RPS Megabit Drive 1 for n > 1000000
• 2009-07-30: Reserved by Borys Jaworski for sieving only n=1700000-5000000
• 2008?: Checked n = 1620000 - 1674483, Peter Benson See range done at web archive.
• 2008-07-24: Found n = 1654383, Peter Benson
• 2008-07-07: Checked to n = 1000000, Gary Barnes released
• 2008-05-25: Checked to n = 965000, Gary Barnes
• 2008-02-17: Found n = 762417, Gary Barnes
• 2008-02-07: Found n = 971585, Peter Benson
• 2008-02-01: Checked to n = 705000, Gary Barnes
• 2008-01-10: Checked to n = 600000, Gary Barnes
• 2008-01-03: Checked n = 400000 - 500000, Gary Barnes
• 2007-12-10: Found n = 499175, Jeffrey Sax
• 2006-02-06: Checked n = 100000 - 110000, Thomas Ritschel, double-check
• 2004-12-24: Checked to n = 400000, Predrag Minovic, released
• 2004-12-19: Found n = 384287, Predrag Minovic
• 2004-12-04: Checked to n = 280000, Predrag Minovic
• 2004-08-06: Checked to n = 210000, Steven Harvey, released
• 2004-07-26: Reserved by Steven Harvey from n=200000
• 1994: Found n = 7799, Harvey Dubner