Riesel primes of the form 157•2n-1

Reserved! This sequence is currently part of Multi Reservation 7: NPLB K300 Drive 3.

Current data

k , b : 157 , 2 Type : Low Count : 29 Nash : 917 Max n : 3,000,000 Date : 2025-03-05 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 5, 33, 97, 121, 125, 305, 445, 473, 513, 1581, 3077, 3517, 6345, 8797, 15265, 16641, 32185, 32581, 43905, 77025, 84377, 202345, 230777, 234401, 473073, 802321, 869073, 1085121

History

• 2025-03-05: Reserved by NPLB K300 Drive 3 from n = 3000000
• 2025-03-05: Checked n = 2300000 - 3000000, NPLB K300 Drive 1, released
• 2024-05-16: Reserved by NPLB K300 Drive 1 from n = 2300000
• 2022-04-10: Checked n = 2200000 - 2300000, RPS Megabit Drive 2
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2019-08-18: Checked n = 1000000 - 2200000, RPS Megabit Drive 2
• 2011-06-04: Found n = 1085121, David Metcalfe, RPS Megabit Drive 2
• 2011-04-28: Reserved by RPS Megabit Drive 2 from n = 1000000
• 2009-07-30: Reserved by Borys Jaworski for sieving only n = 1000000 - 5000000
• 2009-01-11: Checked n = 500000 - 1000000, Max Dettweiler
• 2008-05-18: Found n = 869073, Max Dettweiler
• 2008-05-02: Found n = 802321, Max Dettweiler
• 2008-03-03: Reserved by Max Dettweiler from n = 500000
• 2006-03-23: Checked n = 250000 - 500000, Thomas Ritschel, released
• 2006-03-15: Found n = 473073, Thomas Ritschel
• 2006-02-06: Reserved by Thomas Ritschel
• 2004-06-18: Checked n = 200000 - 250000, Thomas Ritschel, released
• 2004-06-02: Found n = 234401, Thomas Ritschel
• 2004-06-02: Found n = 230777, Thomas Ritschel
• 2004-06-01: Found n = 202345, Thomas Ritschel
• 2004-06-01: Checked n = 1 - 200000, Thomas Ritschel
• 2004-05-26: Reserved by Thomas Ritschel
• 2000-01-17: Found n = 43905, Tom Kuechler