Riesel primes of the form 19•2n-1

Reserved! This sequence is currently reserved by: Michael Kwok

Current data

k , b : 19 , 2 Count : 37 Nash : 1292 Max n : 5,000,000 Date : 2021-03-21 Reserved : Michael KwokMichael Kwok/Reserved

1, 3, 5, 21, 41, 49, 89, 133, 141, 165, 189, 293, 305, 395, 651, 665, 771, 801, 923, 953, 3689, 5315, 6989, 15641, 48819, 78389, 134053, 167843, 181395, 311091, 353661, 645555, 916763, 1325245, 1434165, 1684813, 3155009

Remarks :

The sequence A001775 in OEIS

History

• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2021-02-25: Reserved by Michael Kwok
• 2013-02-12: Checked to n = 5000000, Peter Benson
• 2012-05-31: Checked to n = 4000000, Peter Benson
• 2012-04-08: Found n = 3155009, Peter Benson
• 2012-04-01: Reserved by Peter Benson from n=3000000
• 2011-04-05: released, Peter Benson
• 2011-04-05: Checked to n = 3000000, Peter Benson
• 2011-01-14: Checked to n = 2500000, Peter Benson
• 2010-10-12: Checked to n = 2210000, Peter Benson
• 2010-09-06: Checked to n = 1500000, Peter Benson
• 2010-08-25: Found n = 1325245, Peter Benson
• 2010-07-18: Reserved by Peter Benson
• 2008-12-15: Reserved by Alexander Jones
• 2008-06-01: Found n = 1684813, Peter Benson
• 2008-05-04: Checked to n = 1206000, Michael Kwok, results included
• 2008-04-22: Found n = 1434165, Peter Benson
• 2008-01-01: Checked to n = 1112000, Michael Kwok, results included
• 2007-10-30: Checked to n = 1050000, Michael Kwok, results included
• 2007-08-16: Checked to n = 1000000, Michael Kwok, results included
• 2007-02-13: Found n = 916763, Michael Kwok
• 2006-05-21: Found n = 645555, Michael Kwok
• 2004-04-19: Found n = 353661, Steven Harvey
• 2004-04-13: Found n = 311091, Steven Harvey
• 2004-04-01: Found n = 181395, Steven Harvey
• 2004-04-01: Found n = 167843, Steven Harvey
• 1999-06-12: Found n = 48819, Michael J. Graef
• 1994: Found n = 6989, Harvey Dubner