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Riesel primes of the form 217•2ⁿ-1

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Reserved! This sequence is currently reserved by: Thomas Ritschel

Current data

`k` , `b` :	217 , 2
Type :	Low
Count :	21
Nash :	806
Max `n` :	7,000,000
Date :	2020-06-22
Reserved :	Thomas RitschelThomas Ritschel/Reserved

1, 9, 21, 133, 233, 1393, 1453, 1769, 2041, 3985, 17501, 80341, 148089, 205525, 327829, 377581, 398605, 663509, 1026869, 1059961, 2092673

History

2020-06-22: Checked to n = 7000000, Thomas Ritschel
2019-12-17: Checked to n = 6000000, Thomas Ritschel
2019-09-28: Checked to n = 5000000, Thomas Ritschel
2018-08-13: Found n = 2092673, Thomas Ritschel
2018-06-18: Reserved by Thomas Ritschel, from n=2000000
2013-09-20: Checked to n = 2000000, Lennart Vogel, released
2013-09-17: Reserved by Lennart Vogel from n=1400000
2008-12-28: Found n = 1059961, Alexandre de Pereyra
2008-12-02: Found n = 1026869, Even Stokkedalen
2008-07-05: Found n = 663509, Predrag Minovic
2006-08-21: Found n = 398605, Thomas Ritschel
2006-08-15: Found n = 377581, Thomas Ritschel
2006-08-10: Found n = 327829, Predrag Minovic
2004-07-26: Found n = 205525, Mark Anderson

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