Riesel primes of the form 245•2n-1

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

Current data

k , b : 245 , 2 Count : 25 Nash : 1419 Max n : 2,800,000 Date : 2024-11-13 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

4, 6, 28, 76, 96, 124, 294, 396, 726, 868, 928, 1400, 3056, 6594, 12588, 15708, 88576, 144288, 238468, 606706, 619938, 943088, 1367128, 1407538, 1730188

History

• 2024-05-16: Reserved by NPLB K300 Drive 1 for n > 2300000
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2015-05-05: Checked to n = 2300000, Michael Curtis, released
• 2015-04-01: Checked to n = 2080000, Michael Curtis
• 2014-12-24: Checked to n = 2000000, Michael Curtis
• 2014-10-06: Found n = 1730188, Michael Curtis
• 2014-10-05: Found n = 1407538, Michael Curtis
• 2013-06-11: Checked to n = 1400000, Michael Curtis
• 2011-06-02: Checked to n = 1400000, Michael Curtis
• 2011-04-08: Checked to n = 1290000, Michael Curtis
• 2011-03-14: Found n = 1367128, Michael Curtis
• 2011-02-06: Checked to n = 1220000, Michael Curtis
• 2010-10-28: none, Michael Curtis
• 2010-01-24: Checked to n = 1000000, Michael Curtis
• 2010-01-12: Checked to n = 950000, Michael Curtis
• 2009-12-11: Found n = 943088, Michael Curtis
• 2009-10-14: ~1000000, Michael Curtis
• 2009-09-01: Checked to n = 806000, Michael Curtis
• 2009-02-13: Checked to n = 800000, Michael Curtis
• 2008-07-14: Checked to n = 700000, Michael Curtis
• 2008-01-07: Reserved by Michael Curtis
• 2008-01-06: Checked to n = 640000, Borys Jaworski, released
• 2007-12-16: Found n = 619938, Borys Jaworski
• 2007-11-15: Found n = 606706, Borys Jaworski
• 2007-10-01: Reserved by Borys Jaworski
• 2006-12-16: Checked to n = 600000, RPS Drive 4, released
• 2006-07-28: Reserved by RPS Drive 4, for n = 260000 - 600000
• 2005-11-26: Found n = 238468, Shusuke Kubota
• 2004-11-05: Checked n = 200000 - 230000, Steven Harvey, released