Riesel primes of the form 209•2ⁿ-1

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

Current data

`k` , `b` :	209 , 2
Type :	Low
Count :	18
Nash :	998
Max `n` :	2,800,000
Date :	2024-11-13
Reserved :	No Prime Left BehindNo Prime Left Behind/Reserved

4, 8, 16, 28, 40, 52, 80, 148, 328, 8464, 11704, 52372, 60172, 675232, 692692, 921484, 1207276, 1647640

2024-04-23: Reserved by NPLB K300 Drive 1 for n > 2000000
2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
2013-01-12: Checked to n = 2000000, James P. Burt
2012-05-31: Checked to n = 1830000, James P. Burt
2012-01-06: Found n = 1647640, James P. Burt
2011-04-29: Checked to n = 1300000, James P. Burt
2011-04-28: Found n = 1207276, James P. Burt
2011-04-26: Reserved by James P. Burt
2009-07-30: Reserved by Borys Jaworski from n=1000000
2008-10-23: Checked to n = 1000000, Karsten Bonath
2008-09-15: Found n = 921484, Karsten Bonath
2008-09-01: Checked to n = 886000, Karsten Bonath
2008-06-03: Checked to n = 870000, Karsten Bonath
2007-12-26: Checked to n = 828000, Karsten Bonath
2007-09-10: Checked to n = 764000, Karsten Bonath
2007-07-09: Checked to n = 704000, Karsten Bonath
2007-07-08: Found n = 692692, Karsten Bonath
2007-07-08: Found n = 675232, Karsten Bonath
2000-09-25: Found n = 60172, Tom Kuechler
2000-09-11: Found n = 52372, Tom Kuechler