Riesel primes of the form 221•2ⁿ-1

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

Current data

`k` , `b` :	221 , 2
Type :	Low
Count :	13
Nash :	418
Max `n` :	2,800,000
Date :	2024-11-13
Reserved :	No Prime Left BehindNo Prime Left Behind/Reserved

2, 6, 42, 354, 402, 914, 1562, 10382, 34986, 81042, 104846, 730986, 749166

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
2021-02-13: Checked to n = 2000000, Gary Barnes, double-check n=1000000-1850000, released
2021-02-13: Reserved by Gary Barnes
2014-09-13: Checked to n = 1850000, Steven Tjung
2013-08-22: Checked to n = 1500000, Steven Tjung
2012-08-19: Checked to n = 1100000, Steven Tjung
2009-12-05: Checked to n = 1100000, Steven Tjung
2009-05-15: Checked to n = 1050000, Steven Tjung
2009-04-06: none, Steven Tjung
2009-02-12: Checked to n = 1000000, Steven Tjung
2008-12-03: Checked to n = 860000, Michael Curtis
2008-10-26: Found n = 749166, Michael Curtis
2008-03-15: Reserved by Michael Curtis
2008-03-01: Checked to n = 740000, Borys Jaworski, released
2008-02-25: Found n = 730986, Borys Jaworski
2008-02-09: Checked to n = 700000, Borys Jaworski
2008-02-03: Checked to n = 690000, Borys Jaworski
2008-01-12: Checked to n = 650000, Borys Jaworski
2008-01-06: Checked to n = 640000, Borys Jaworski
2007-10-01: Reserved by Borys Jaworski
1998-11-30: Found n = 34986, Wilfrid Keller