Riesel primes of the form 5•2n-1

Current data

k , b : 5 , 2 Count : 51 Nash : 2180 Max n : 12,000,000 Date : 2021-10-09

2, 4, 8, 10, 12, 14, 18, 32, 48, 54, 72, 148, 184, 248, 270, 274, 420, 1340, 1438, 1522, 1638, 1754, 1884, 2014, 2170, 2548, 2622, 2652, 2704, 13510, 21738, 25624, 41934, 51478, 52540, 53230, 172300, 245728, 350028, 1194164, 2460482, 3059698, 3090860, 3264650, 3569154, 5429494, 7037188, 7755002, 10349000, 10495620, 11355764

Remarks :

The sequence A001770 in OEIS

History

• 2021-10-09: Checked to n = 12000000, Ryan Propper, released
• 2021-10-03: Found n = 11355764, Ryan Propper
• 2021-09-27: Checked to n = 10000000, Ryan Propper
• 2021-09-27: Found n = 10495620, Ryan Propper
• 2021-09-27: Found n = 10349000, Ryan Propper
• 2021-09-22: Found n = 7755002, Ryan Propper
• 2021-09-22: Found n = 7037188, Ryan Propper
• 2021-09-17: Reserved by Ryan Propper
• 2021-09-17: Checked to n = 6000000, RPS Drive K5
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2017-01-13: Found n = 5429494, Dmitry Domanov, RPS Drive K5
• 2013-07-08: Found n = 3264650, Carlos Eduardo Pinho, RPS Drive K5
• 2012-04-11: Found n = 3090860, Michael Curtis, RPS Drive K5
• 2009-01: Checked n = 3499089 - 3646019?, Peter Benson assumed done. See sieve file gap for 3499088<n<3646020 here.
• 2009-01-05: Found n = 3569154, Peter Benson
• 2008-11: Checked n = 3000001 - 3060789?, Peter Benson assumed done. See drive search gap for n>3000000 and n<3060790.
• 2008-11-24: Found n = 3059698, Peter Benson
• 2008-11: Checked n = 2366469 - 2461799?, Peter Benson assumed done. See drive search gap for n>2366468 and n<2461800.
• 2008-11-19: Found n = 2460482, Peter Benson
• 2008-02-01: Checked n = 1240000 - 1252000, Gary Barnes, RPS Drive K5
• 2008-01-20: Found n = 1194164, Adam Sutton, Ed Goforth, RPS Drive K5
• 2007-12-27: Checked n = 1150000 - 1158700, Gary Barnes, RPS Drive K5
• 2007-10-03: Reserved by RPS Drive K5 for n > 470000
• 2004-05-03: Checked to n = 313900, Phil Carmody
• 2004-05-01: Found n = 350028, Phil Carmody
• 2004-05-01: Found n = 245728, Phil Carmody
• 1999-12-25: Found n = 172300, Ingo Buechel, Wilfrid Keller
• 1998-12-18: Found n = 53230, Ingo Buechel, Wilfrid Keller
• 1998-12-18: Found n = 52540, Ingo Buechel, Wilfrid Keller
• 1998-12-18: Found n = 51478, Ingo Buechel, Wilfrid Keller
• 1998-08-31: Found n = 41934, Wilfrid Keller
• 1998-07-28: Found n = 25624, Wilfrid Keller
• 1998-05-29: Found n = 21738, Henri Lifchitz