Riesel primes of the form 271•2n-1

Current data

k , b : 271 , 2 Count : 24 Nash : 1510 Max n : 5,212,000 Date : 2024-04-23

1, 7, 21, 55, 175, 235, 2289, 12419, 19917, 19971, 21979, 54007, 66241, 68757, 98595, 241211, 274509, 322971, 342349, 470529, 786059, 1004527, 2223601, 3079189

History

• 2024-04-23: Checked to n = 5212000, Thomas Ritschel, released
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2019-12-17: Checked to n = 5000000, Thomas Ritschel
• 2019-09-28: Checked to n = 4000000, Thomas Ritschel
• 2018-11-19: Found n = 3079189, Thomas Ritschel
• 2018-08-31: Found n = 2223601, Thomas Ritschel
• 2018-06-18: Reserved by Thomas Ritschel, from n=2000000
• 2013-03-10: Checked to n = 2000000, Thomas Ritschel, released
• 2013-02-12: Reserved by Thomas Ritschel from n=1300000
• 2012-05-14: Checked to n = 1300000, James P. Burt, released
• 2011-12-31: Checked to n = 1100000, James P. Burt
• 2011-12-10: Reserved by James P. Burt from n=1000000
• 2011-12-05: Found n = 1004527, James P. Burt
• 2009-07-30: Reserved by Borys Jaworski for sieving only n=1000000-5000000
• 2008-10-22: Checked to n = 1000000, NPLB Drive 4, released
• 2008-09-26: Found n = 786059, Max Dettweiler, NPLB Drive 4
• 2008-09-09: Reserved by NPLB Drive 4
• 2006-12-16: Checked to n = 600000, RPS Drive 4, released
• 2006-09-06: Found n = 470529, Predrag Minovic, RPS Drive 4
• 2006-08-08: Found n = 342349, David Metcalfe, RPS Drive 4
• 2006-08-07: Found n = 322971, Larry Soule, RPS Drive 4
• 2006-07-30: Found n = 274509, Larry Soule, RPS Drive 4
• 2006-07-28: Reserved by RPS Drive 4, for n = 260000 - 600000
• 2005-04-04: Found n = 241211, James S. Griffin
• 1998-12-09: Found n = 21979, Wilfrid Keller