Riesel primes of the form 217•2n-1

Reserved! This sequence is currently reserved by: Thomas Ritschel

Current data

k , b : 217 , {{{Rb}}} Count : Attention! Parameter RCount=21 not given! 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

[[Category:Riesel {{{Rb}}}|#.....00217]][[Category:Riesel {{{Rb}}} Low-weight|#.....00217]]

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