Riesel primes of the form 89•2n-1

Current data

k , b : 89 , 2 Count : 23 Nash : 1238 Max n : 4,000,000 Date : 2024-07-01

4, 8, 12, 24, 48, 52, 64, 84, 96, 1272, 2028, 3224, 4952, 6892, 7372, 16476, 56968, 68632, 185868, 208824, 369628, 1383108, 1879132

History

• 2024-07-01: Reservation dropped, Vincent Diepeveen
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2020-11-21: Reserved by Vincent Diepeveen
• 2020-11-21: Checked to n = 4000000, Richard Kapek, released
• 2020-08-22: Checked to n = 3400000, Richard Kapek
• 2020-06-06: Checked to n = 3100000, Richard Kapek
• 2020-04-10: Reserved by Richard Kapek from n=3000000
• 2018-08-30: Checked to n = 3000000, David Metcalfe, released
• 2018-07-14: Reserved by David Metcalfe
• 2013-05-23: Checked to n = 2000000, Peter Benson, released
• 2013-05-12: Found n = 1879132, Peter Benson
• 2013-05-11: Reserved by Peter Benson from n=1620000
• 2012-10-21: Checked to n = 1620000, Oscar Tutusaus Santandreu, released
• 2012-08-14: Checked to n = 1580000, Oscar Tutusaus Santandreu
• 2012-07-14: Checked to n = 1530000, Oscar Tutusaus Santandreu
• 2012-06-06: Checked to n = 1460000, Oscar Tutusaus Santandreu
• 2012-05-10: Reserved by Oscar Tutusaus Santandreu from n=1400000
• 2011-03-14: Checked to n = 1400000, Borys Jaworski, released
• 2011-03-14: Found n = 1383108, Borys Jaworski
• 2011-02-28: Checked to n = 1340000, Borys Jaworski
• 2011-01-31: Checked to n = 1250000, Borys Jaworski
• 2011-01-03: Checked to n = 1140000, Borys Jaworski
• 2010-12-23: Reserved by Borys Jaworski from n=1120000
• 2009-07-30: Reserved by Borys Jaworski for sieving only n=1120000-5000000
• 2008-02-24: Checked to n = 780000, Predrag Minovic
• 2007-06-08: Reserved by Predrag Minovic
• 2005-03-29: Checked to n = 520000, Predrag Minovic, released
• 2005-03-22: Checked to n = 500000, Predrag Minovic
• 2005-02-13: Checked to n = 380000, Predrag Minovic
• 2005-01-31: Found n = 369628, Predrag Minovic
• 2004-08-03: Checked to n = 300000, Predrag Minovic
• 2004-07-07: Checked to n = 275000, Predrag Minovic
• 2004-06-28: Found n = 208824, Predrag Minovic
• 2004-06-25: Found n = 185868, Predrag Minovic
• 2004-06-18: Reserved by Predrag Minovic
• 2000-07-19: Found n = 56968, Tom Kuechler
• 1994: Found n = 7372, Harvey Dubner
• 1994: Found n = 6892, Harvey Dubner