Riesel primes of the form 81•2n-1

Current data

k , b : 81 , 2 Type : 3 Count : 37 Nash : 1698 Max n : 3,250,000 Date : 2024-05-07

3, 5, 11, 17, 21, 27, 81, 101, 107, 327, 383, 387, 941, 1665, 3515, 4007, 4727, 7137, 16257, 16833, 21243, 24239, 35435, 59925, 91673, 153455, 165341, 183167, 190349, 240743, 253385, 308325, 741917, 1335675, 2375447, 2797443, 3174353

History

• 2024-05-07: Reservation dropped, William Byerly
• 2022-04-07: Checked n = 2031000 - 3250000, William Byerly
• 2022-01-10: Found n = 3174353, William Byerly
• 2021-11-19: Found n = 2797443, William Byerly
• 2021-11-10: Found n = 2375447, William Byerly
• 2021-10-21: Reserved by William Byerly
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2013-12-15: none, Michael Kwok, released
• 2013-09-12: Checked n = 2000000 - 2031000, Michael Kwok, results included
• 2013-08-01: Reserved by Michael Kwok
• 2012-05-10: Checked n = 1960000 - 2000000, David Metcalfe, released
• 2012-04-30: Checked n = 1800000 - 1960000, David Metcalfe
• 2012-03-31: Checked n = 1670000 - 1800000, David Metcalfe
• 2012-02-29: Checked n = 1610000 - 1670000, David Metcalfe
• 2012-01-31: Checked n = 1520000 - 1610000, David Metcalfe
• 2011-12-31: Checked n = 1430000 - 1520000, David Metcalfe
• 2011-12-01: Checked n = 1340000 - 1430000, David Metcalfe
• 2011-10-31: Reserved by David Metcalfe
• 2009-01-10: Checked n = 1600000 - 1655000, David Metcalfe
• 2009-01-09: Checked n = 950000 - 976222, 1652056 - 1652604, Peter Benson
• 2008-12-09: Checked n = 1200000 - 1340000, David Metcalfe
• 2008-09-11: Reserved by Carlos Eduardo Pinho
• 2008-06-10: Found n = 1335675, David Metcalfe
• 2008-02-12: Checked n = 1150000 - 1200000, David Metcalfe
• 2008-01-18: Checked n = 1060000 - 1150000, David Metcalfe
• 2007-12-01: Checked n = 1025000 - 1060000, David Metcalfe
• 2007-11-05: Checked n = 900000 - 1025000, David Metcalfe
• 2007-08-18: Checked n = 840000 - 900000, David Metcalfe
• 2007-07-16: Checked n = 800000 - 840000, David Metcalfe
• 2007-06-28: Checked n = 760000 - 800000, David Metcalfe
• 2007-06-08: Checked n = 705000 - 760000, David Metcalfe
• 2007-05-30: Found n = 741917, David Metcalfe
• 2007-05-11: Checked n = 650000 - 705000, David Metcalfe
• 2007-04-18: Checked n = 500000 - 650000, David Metcalfe
• 2007-02-04: Reserved by David Metcalfe from n = 500000
• 2006-06-25: Checked n = 476000 - 500000, Chris Chatfield, released
• 2006-06-11: Checked n = 220000 - 476000, Chris Chatfield
• 2006-04-13: Found n = 308325, Chris Chatfield
• 2006-04-07: Found n = 253385, Chris Chatfield
• 2006-04-06: Found n = 240743, Chris Chatfield
• 2006-04-02: Reserved by Chris Chatfield
• 2006-04-02: Reservation dropped, (Chaos)
• 2005-09-20: Reserved by (Chaos)
• 2004-06-08: Checked n = 204000 - 220000, Harsh Aggarwal, released
• 2004-05-14: Checked n = 200000 - 204000, Harsh Aggarwal
• 2004-05-11: Checked n = 75000 - 100000, Harsh Aggarwal
• 2004-05-10: Checked n = 1 - 75000, 100000 - 200000, Harsh Aggarwal
• 2004-05-10: Found n = 190349, Harsh Aggarwal
• 2004-05-10: Found n = 183167, Harsh Aggarwal
• 2004-05-10: Found n = 165341, Harsh Aggarwal
• 2004-04-14: Reserved by Harsh Aggarwal
• 1999-01-13: Found n = 35435, Tom Kuechler
• 1999-01-07: Found n = 24239, Tom Kuechler
• 1994: Found n = 7137, Harvey Dubner