Riesel primes of the form 123•2n-1

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

Current data

k , b : 123 , 2 Type : 3 Count : 53 Nash : 2133 Max n : 2,800,000 Date : 2024-11-13 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

2, 3, 11, 15, 23, 24, 27, 35, 71, 84, 108, 122, 123, 138, 236, 242, 290, 392, 500, 611, 747, 771, 1106, 1490, 3560, 5111, 6066, 8660, 8927, 19451, 19730, 28316, 30471, 49515, 93762, 117083, 168435, 206663, 249242, 255402, 261530, 355727, 389052, 516456, 518540, 521031, 939098, 958050, 968927, 1225115, 1241690, 1779728, 2583362

History

• 2024-08-18: Found n = 2583362, Gary Barnes, NPLB K300 Drive 1
• 2024-05-16: Reserved by NPLB K300 Drive 1 for n > 2300000
• 2022-04-10: Checked to n = 2300000, RPS Megabit Drive 2
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2019-08-18: Checked to n = 2200000, RPS Megabit Drive 2
• 2014-10-16: Found n = 1779728, Kai Inouye, RPS Megabit Drive 2
• 2011-07-23: Found n = 1241690, David Metcalfe, RPS Megabit Drive 2
• 2011-07-15: Found n = 1225115, David Metcalfe, RPS Megabit Drive 2
• 2011-04-28: Reserved by RPS Megabit Drive 2 for n > 1000000
• 2009-09-14: Checked to n = 1000000, RPS 9ks Drive, released
• 2009-09-04: Found n = 958050, Carlos Eduardo Pinho, RPS 9ks Drive
• 2009-08-26: Found n = 968927, Carlos Eduardo Pinho, RPS 9ks Drive
• 2009-08-24: Found n = 939098, Thomas Ritschel, RPS 9ks Drive
• 2007-12-03: Reserved by RPS 9ks Drive for n > 700000. See post that started drive here.
• 2007-02-02: Checked to n = 700000, Thomas Masser, released
• 2005-10-05: Checked to n = 700000, Thomas Masser
• 2005-05-19: Found n = 518540, Thomas Masser
• 2005-05-19: Found n = 516456, Thomas Masser
• 2005-05-18: Found n = 521031, Thomas Masser
• 2005-03-08: Found n = 389052, Thomas Masser
• 2005-01-06: Checked to n = 380000, Thomas Masser
• 2005-01-04: Checked n = 200000  -  <300000, Thomas Masser
• 2004-05-23: Found n = 355727, Mark Anderson
• 2004-04-10: Found n = 261530, Mark Anderson
• 2004-04-09: Found n = 255402, Mark Anderson
• 2004-04-08: Found n = 249242, Mark Anderson
• 2004-04-01: Found n = 206663, Mark Anderson
• 2004-04-01: Reserved by Mark Anderson
• 2004-03-29: Found n = 168435, Mark Anderson
• 1989: Found n = 8927, Sergio Zarantonello, Joel Smith, Gene Smith, Bodo Parady, Landon Curt Noll, John Brown