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Riesel primes of the form 397•2ⁿ-1

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Current data

`k` , `b` :	397 , 2
Type :	Low
Count :	18
Nash :	854
Max `n` :	2,000,000
Date :	2013-04-08

5, 21, 29, 33, 53, 449, 525, 1293, 1713, 3681, 16305, 50133, 171945, 268601, 307581, 369573, 823745, 926925

History

2013-04-08: Checked to n = 2000000, Ian M. Gunn, released
2013-03-06: Reserved by Ian M. Gunn, for 1300000<n<2000000
2010-09-07: Checked to n = 1300000, Ian M. Gunn, released
2010-07-12: Checked to n = 1200000, Ian M. Gunn
2010-05-18: Checked to n = 1100000, Ian M. Gunn
2010-03-21: Reserved by Ian M. Gunn, for 1000000<n<1300000
2008-12-21: Checked to n = 1000000, Ian M. Gunn, released
2008-12-18: Checked to n = 800000, Ian M. Gunn
2008-12-14: Found n = 823745, Ian M. Gunn
2008-12-09: Checked to n = 700000, Ian M. Gunn
2008-12-04: Found n = 926925, Ian M. Gunn
2008-12-03: Checked to n = 628000, Ian M. Gunn
2008-11-26: Reserved by Ian M. Gunn, for 600000<n<1000000
2008-11-10: Checked to n = 600000, NPLB Drive 3, released
2008-03-08: Found n = 369573, Chris Chatfield
2008-03-06: 307581 confirmed, James P. Burt
2008-03-01: Reserved by NPLB Drive 3, for 260000<n<600000
2004-11-17: Found n = 307581, Peter O'braian
2004-10-21: Found n = 268601, Peter O'braian
2003-08-17: Found n = 171945, Peter O'braian

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