Riesel primes of the form 15•2n-1

Current data

k , b : 15 , 2 Type : 315 Count : 58 Nash : 2221 Max n : 7,000,000 Date : 2024-09-02

1, 2, 4, 5, 10, 14, 17, 31, 41, 73, 80, 82, 116, 125, 145, 157, 172, 202, 224, 266, 289, 293, 463, 1004, 1246, 2066, 2431, 2705, 4622, 5270, 7613, 21727, 21962, 40742, 41054, 60622, 83263, 83669, 91457, 103940, 104177, 108124, 115327, 161453, 172714, 454681, 568780, 656264, 712294, 902474, 1084010, 1344313, 1837873, 2323205, 3668194, 6429089, 6993631, 9482269

Remarks :

The sequence A002237 in OEIS

History

• 2024-09-02: Checked n = 2 - 100000, Mark Rodenkirch, double-check, released
• 2024-08-22: Reserved by Mark Rodenkirch for n = 2 - 100000, double-check
• 2024-08-14: Found n = 9482269, Ryan Propper
• 2024-06-13: Checked n = 6000000 - 7000000, Ryan Propper
• 2021-11-20: Checked n = 1908000 - 1967597, 2062945 - 6134000, RPS Drive K15, released
• 2021-10-08: Found n = 6429089, Ryan Propper
• 2021-08-25: Found n = 6993631, Ryan Propper
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2013-10-15: Found n = 3668194, Ivica Kelava, RPS Drive K15
• 2011-07-11: Found n = 2323205, Thomas Ritschel, RPS Drive K15
• 2010-01-03: Checked n = 1880000 - 1908000, RPS Drive K15
• 2009-02-13: Checked n = 1000000 - 1880000, RPS Drive K15
• 2009-01-09: Checked n = 1967597 - 2062945, Peter Benson
• 2009-01-09: Checked n = 950000 - 1045993, 1140017 - 1196900, Peter Benson ( n = 1000000 - 1045993 & n = 1140017 - 1196900 also done by RPS Drive K15 )
• 2008-12-16: Found n = 1837873, Even Stokkedalen, RPS Drive K15
• 2007-01-05: Found n = 1344313, David Metcalfe, RPS Drive K15
• 2006-09-28: Found n = 1084010, David Metcalfe, RPS Drive K15
• 2006-09-12: Reserved by RPS Drive K15 from n = 1000000
• 2006-03-02: Found n = 902474, Robert Smith
• 2005-08-12: Found n = 712294, Robert Smith
• 2005-05-17: Found n = 656264, Robert Smith
• 2005-03-29: Checked n = 505000 - 620000, Robert Smith
• 2005-02-27: Found n = 568780, Robert Smith
• 2004-09-06: Checked n = 475000 - 505000, Robert Smith
• 2004-06-03: Checked n = 340000 - 475000, Robert Smith
• 2004-05-13: Found n = 454681, Robert Smith
• 2004-04-15: Checked to n = 340000, Robert Smith
• 2004-03-30: Found n = 172714, Robert Smith
• 2004-03-30: Found n = 161453, Robert Smith
• 2003-04-07: Found n = 115327, Steven Harvey
• 1999-08-09: Found n = 91457, Michael J. Graef
• 1999-07-08: Found n = 83669, Michael J. Graef
• 1999-07-07: Found n = 83263, Michael J. Graef
• 1999-06-29: Found n = 60622, Michael J. Graef
• 1999-06-03: Found n = 41054, Michael J. Graef
• 1999-06-03: Found n = 40742, Michael J. Graef
• 1998-08-09: Found n = 21962, Wilfrid Keller
• 1998-08-08: Found n = 21727, Wilfrid Keller
• 1994: Found n = 7613, Harvey Dubner