Riesel primes of the form 15•2n-1

Reserved! This sequence is currently reserved by: Riesel Prime Search

Current data

k , b : 15 , 2 Type : 315 Count : 55 Nash : 2221 Max n : 5,800,000 Date : 2021-03-21 Reserved : Riesel Prime SearchRiesel Prime Search/Reserved

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

Remarks :

Forum thread at MersenneForum The sequence A002237 in OEIS

History

• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2021-01-27: Checked to n = 5800000, Thomas Ritschel, RPS Drive k15
• 2018-04-11: Checked to n = 5500000, RPS Drive k15
• 2013-10-15: Found n = 3668194, Ivica Kelava
• 2011-07-11: Found n = 2323205, Thomas Ritschel
• 2010-01-03: Checked to n = 1908000, Predrag Minovic
• 2009-02-13: Checked to n = 1880000, Predrag Minovic
• 2008-12-16: Found n = 1837873, Even Stokkedalen
• 2007-01-05: Found n = 1344313, David Metcalfe
• 2006-09-28: Found n = 1084010, David Metcalfe
• 2006-03-02: Found n = 902474, Robert Smith
• 2005-08-12: Found n = 712294, Robert Smith
• 2005-05-17: Found n = 656264, Robert Smith
• 2005-02-27: Found n = 568780, Robert Smith
• 2004-05-13: Found n = 454681, 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