Riesel primes of the form 207•2n-1

Reserved! This sequence is currently part of Multi Reservation 7: NPLB K300 Drive 1.

Current data

k , b : 207 , 2 Type : 3 Count : 38 Nash : 1798 Max n : 2,800,000 Date : 2024-11-13 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

2, 9, 12, 17, 20, 21, 50, 53, 132, 168, 341, 360, 381, 501, 1065, 1169, 1545, 2109, 2520, 2661, 3149, 4077, 11252, 21588, 21692, 39509, 52685, 67196, 87708, 232436, 372312, 417818, 481385, 507833, 643478, 912512, 1453970, 2212517

History

• 2024-05-08: Found n = 2212517, Gary Barnes, NPLB K300 Drive 1
• 2024-04-23: Reserved by NPLB K300 Drive 1 for n > 2000000
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2021-02-13: Checked to n = 2000000, Steven Tjung, released
• 2016-01-27: Checked to n = 2000000, Steven Tjung
• 2014-01-13: Checked to n = 1730000, Steven Tjung
• 2014-09-13: Checked to n = 1700000, Steven Tjung
• 2014-02-03: Checked to n = 1590000, Steven Tjung
• 2013-11-06: Found n = 1453970, Steven Tjung
• 2013-08-22: Checked to n = 1342000, Steven Tjung
• 2013-04-05: Checked to n = 1200000, Steven Tjung
• 2012-11-03: Checked to n = 1100000, Steven Tjung
• 2012-10-19: Checked to n = 1084000, Steven Tjung
• 2012-08-19: Checked to n = 1030000, Steven Tjung
• 2009-12-05: none, Steven Tjung
• 2009-10-06: Checked to n = 1000000, Steven Tjung
• 2009-05-14: Checked to n = 925000, Steven Tjung
• 2009-05-14: Found n = 912512, Steven Tjung
• 2009-04-06: Checked to n = 900000, Steven Tjung
• 2009-02-12: Checked to n = 845000, Steven Tjung
• 2008-01-31: Checked to n = 704000, Steven Tjung
• 2008-01-04: Checked to n = 662000, Steven Tjung
• 2007-12-07: Checked to n = 646000, Steven Tjung
• 2007-12-07: Found n = 643478, Steven Tjung
• 2007-11-01: none, Steven Tjung
• 2007-09-06: Checked to n = 586000, Steven Tjung
• 2007-07-13: Checked to n = 583000, Steven Tjung
• 2007-06-25: Checked to n = 571000, Steven Tjung
• 2007-05-14: Found n = 507833, Steven Tjung
• 2007-05-01: Found n = 481385, Steven Tjung
• 2007-04-22: Checked to n = 460000, Steven Tjung
• 2007-03-16: Found n = 417818, Steven Tjung
• 2007-03-15: Found n = 372312, Steven Tjung
• 2007-03-10: Checked to n = 342000, Steven Tjung
• 2007-01-12: Checked to n = 300000, Steven Tjung
• 2006-11-03: Checked to n = 273000, Steven Tjung
• 2006-09-05: Reserved by Steven Tjung
• 2004?: Checked to n = 250000, Mark Anderson, released
• 2004-08-05: Found n = 232436, Mark Anderson
• 2004-06-04: Reserved by Mark Anderson, for n ≤ 250000
• 1989: Found n = 67196, Sergio Zarantonello, Joel Smith, Gene Smith, Bodo Parady, Landon Curt Noll, John Brown