Riesel primes of the form 31•2n-1

Reserved! This sequence is currently reserved by: Michael Curtis

Current data

k , b : 31 , 2 Count : 50 Nash : 2188 Max n : 2,282,000 Date : 2021-03-21 Reserved : Michael CurtisMichael Curtis/Reserved

1, 5, 7, 11, 13, 23, 33, 35, 37, 47, 115, 205, 235, 271, 409, 739, 837, 887, 2189, 3465, 4653, 5073, 8011, 8061, 21957, 24589, 25657, 44653, 50321, 57647, 62083, 78179, 80021, 81655, 111667, 150265, 177089, 196433, 274115, 306751, 311389, 315523, 406105, 421129, 666285, 773227, 1142093, 1611311, 1755317, 2585311

History

• 2022-12-03: Found n = 2585311, Michael Curtis
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2021-02-13: Reserved by Michael Curtis
• 2016-01-27: Checked to n = 2282000, Steven Tjung
• 2014-01-13: Checked to n = 2100000, Steven Tjung
• 2014-09-13: Checked to n = 2066000, Steven Tjung
• 2013-08-22: none, Steven Tjung
• 2012-08-19: Checked to n = 2020000, Steven Tjung
• 2011-01-28: Found n = 1755317, Steven Tjung
• 2010-02-24: Found n = 1611311, Steven Tjung
• 2009-12-05: Checked to n = 1600000, Steven Tjung
• 2009-10-06: Checked to n = 1570000, Steven Tjung
• 2009-05-15: Checked to n = 1510000, Steven Tjung
• 2009-04-06: Checked to n = 1370000, Steven Tjung
• 2009-02-12: Checked to n = 1350000, Steven Tjung
• 2008-12-09: Found n = 421129, Raffaele De Troia
• 2008-12-02: Found n = 406105, Raffaele De Troia
• 2008-11-21: Checked to n = 1300000, Steven Tjung
• 2008-04-02: Found n = 1142093, Peter Benson
• 2008-01-31: Checked to n = 735000, Steven Tjung
• 2008-01-02: Checked to n = 707000, Steven Tjung
• 2007-12-30: Found n = 666285, Steven Tjung
• 2007-12-08: Checked to n = 685000, Steven Tjung
• 2007-12-07: Found n = 773227, Steven Tjung
• 2007-11-01: Checked to n = 645000, Steven Tjung
• 2007-07-13: Checked to n = 570000, Steven Tjung
• 2007-07-13: Checked to n = 567000, Steven Tjung
• 2004-04-28: Found n = 315523, Steven Harvey
• 2004-04-27: Found n = 311389, Steven Harvey
• 2004-04-26: Found n = 306751, Steven Harvey
• 2004-04-19: Found n = 274115, Steven Harvey
• 2004-04-05: Found n = 196433, Steven Harvey
• 2004-04-04: Found n = 177089, Steven Harvey
• 2003-03-20: Found n = 111667, Steven Harvey
• 2000-06-03: Found n = 62083, Phil Carmody
• 2000-05-31: Found n = 57647, Phil Carmody
• 2000-05-22: Found n = 44653, Phil Carmody
• 1998-08-13: Found n = 25657, Wilfrid Keller
• 1998-08-13: Found n = 24589, Wilfrid Keller
• 1998-08-09: Found n = 21957, Wilfrid Keller