Riesel primes of the form 91•2n-1

Reserved! This sequence is currently part of Multi Reservation 4: NPLB K300 Drive 2.

Current data

k , b : 91 , 2 Count : 52 Nash : 2374 Max n : 3,100,000 Date : 2025-03-12 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 3, 9, 13, 15, 17, 19, 23, 47, 57, 67, 73, 77, 81, 83, 191, 301, 321, 435, 867, 869, 917, 6009, 6051, 8077, 9003, 10355, 10719, 11217, 20197, 22011, 36379, 45373, 53441, 77013, 86329, 89853, 90341, 104783, 169779, 187407, 245989, 313849, 535819, 563469, 633169, 711335, 787173, 1026521, 1742093, 2407249, 2494467

History

• 2025-03-05: Checked n = 2000000 - 3000000, NPLB K300 Drive 1, released
• 2025-02-27: Reserved by NPLB K300 Drive 2 from n = 3000000
• 2024-06-30: Found n = 2494467, Gary Barnes, NPLB K300 Drive 1
• 2024-06-11: Found n = 2407249, Florian Piesker, NPLB K300 Drive 1
• 2024-04-26: Reserved by NPLB K300 Drive 1 from n = 2000000
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2013-01-12: Checked n = 1830000 - 2000000, James P. Burt
• 2012-05-31: Checked n = 1600000 - 1830000, James P. Burt
• 2012-05-19: Found n = 1742093, James P. Burt
• 2011-12-10: Checked n = 1300000 - 1600000, James P. Burt
• 2011-05-07: Checked n = 1120000 - 1300000, James P. Burt
• 2011-04-25: Reserved by James P. Burt
• 2010-02-11: Checked n = 1030000 - 1070000, 1113000 - 1120000, Predrag Minovic, released
• 2009-07-30: Reserved by Borys Jaworski for sieving only n = 1120000 - 5000000
• 2009-07-26: Checked n = 1070000 - 1113000, (unknown), See range done at RPS other completed ranges.
• 2009-07-26: Checked to n = 1030000, Predrag Minovic ?, See limit at above link.
• 2009-01-10: Reserved by Predrag Minovic for n = 1030000 - 1070000
• 2009-01-09: Checked n = 950000 - 971406, Peter Benson
• 2008-12-25: Found n = 1026521, Predrag Minovic
• 2008-02-24: Checked n = 600000 - 780000, Predrag Minovic
• 2008-02-19: Found n = 787173, Predrag Minovic
• 2007-10-15: Found n = 711335, Predrag Minovic
• 2007-09-02: Found n = 633169, Ed Goforth, Predrag Minovic
• 2007-06-08: Reserved by Predrag Minovic to n = 1120000
• 2006-12-16: Checked n = 300000 - 600000, RPS Drive 4, released
• 2006-11-02: Found n = 563469, Predrag Minovic, RPS Drive 4
• 2006-10-10: Found n = 535819, Predrag Minovic, RPS Drive 4
• 2006-08-07: Found n = 313849, Thomas Ritschel, RPS Drive 4
• 2006-07-28: Reserved by RPS Drive 4, for n = 300000 - 600000
• 2005-01-31: Checked n = 210000 - 300000, Steven Harvey, released
• 2005-01-25: Found n = 245989, Steven Harvey
• 2005-01-22: Reserved by Steven Harvey for n = 210000 - 300000
• 2005-01-04: Checked n = 200000 - 210000, Steven Harvey
• 2004-06-30: Checked n = 40000 - 200000, Steven Harvey, released
• 2004-06-29: Found n = 187407, Steven Harvey
• 2004-06-28: Found n = 169779, Steven Harvey
• 2004-06-24: Reserved by Steven Harvey to n = 200000
• 1999-09-07: Found n = 45373, Tom Kuechler
• 1999-04-01: Found n = 36379, Tom Kuechler