Riesel primes of the form 217•2ⁿ-1

Current data

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

2024-04-23: Reservation dropped, Thomas Ritschel
2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
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
2011-02-01: Checked to n = 1400000, RPS Drive 6, released
2008-12-28: Found n = 1059961, Alexandre de Pereyra, RPS Drive 6
2008-12-02: Found n = 1026869, Even Stokkedalen, RPS Drive 6
2008-07-05: Found n = 663509, Predrag Minovic, RPS Drive 6
2008-06-22: Reserved by RPS Drive 6, for n > 600000
2006-12-16: Checked to n = 600000, RPS Drive 4, released
2006-08-21: Found n = 398605, Thomas Ritschel, RPS Drive 4
2006-08-15: Found n = 377581, Thomas Ritschel, RPS Drive 4
2006-08-10: Found n = 327829, Predrag Minovic, RPS Drive 4
2006-07-28: Reserved by RPS Drive 4, for n = 260000 - 600000
2004?: Checked to n = 250000, Mark Anderson, released
2004-07-26: Found n = 205525, Mark Anderson
2004-06-04: Reserved by Mark Anderson, for n ≤ 250000