Riesel primes of the form 255•2n-1

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

Current data

k , b : 255 , 2 Type : 315 Count : 74 Nash : 3297 Max n : 2,700,000 Date : 2024-10-04 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 2, 3, 4, 6, 11, 12, 24, 40, 41, 61, 75, 86, 95, 158, 207, 223, 242, 276, 338, 390, 488, 673, 804, 1084, 1332, 1467, 1588, 2894, 3650, 4367, 6001, 6372, 10162, 10235, 10660, 12988, 17470, 18323, 18673, 24137, 24335, 24797, 28573, 35636, 36275, 44015, 49167, 55106, 58106, 58202, 58476, 90852, 118030, 120342, 138101, 154397, 206716, 230830, 259537, 281366, 405467, 450144, 450762, 481837, 577903, 592080, 601910, 635715, 962590, 1037444, 1422283, 1763221, 2010691

Remarks :

Thread at MersenneForum See also Williams 255•256n-1

History

• 2024-04-23: Found n = 2010691, 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
• 2015-06-07: Checked n = 1800000 - 2000000, Thomas Ritschel
• 2015-04-29: Checked n = 1730000 - 1800000, Thomas Ritschel
• 2015-04-26: Found n = 1763221, Thomas Ritschel
• 2013-05-12: Checked n = 1700000 - 1730000, Predrag Minovic
• 2012-12-10: Checked n = 1600000 - 1650000, Predrag Minovic
• 2012-10-10: Checked n = 1650000 - 1700000, Thomas Ritschel
• 2012-09-20: Checked n = 1450000 - 1600000, Peter Benson
• 2012-09-09: Checked n = 1370000 - 1450000, Predrag Minovic
• 2012-09-06: Checked n = 1300000 - 1370000, Michael Curtis
• 2012-08-17: Found n = 1422283, Predrag Minovic
• 2012-07-18: Checked n = 1100000 - 1300000, Peter Benson
• 2012-07-16: Checked n = 1000000 - 1100000, Predrag Minovic
• 2012-07-02: Checked to n = 1070000, Predrag Minovic
• 2012-06-15: Found n = 1037444, Predrag Minovic
• 2010-01-31: Checked to n = 1000000, James S. Griffin
• 2008-05-03: Found n = 962590, James S. Griffin
• 2007-11-10: Checked to n = 820000, James S. Griffin
• 2007-05-26: Found n = 635715, James S. Griffin
• 2007-02-05: Found n = 601910, James S. Griffin
• 2007-01-18: Found n = 592080, James S. Griffin
• 2006-12-30: Found n = 577903, James S. Griffin
• 2005-11-28: Found n = 481837, James S. Griffin
• 2005-09-02: Found n = 450762, James S. Griffin
• 2005-09-01: Found n = 450144, James S. Griffin
• 2005-06-28: Found n = 405467, James S. Griffin
• 2004-12-27: Checked n = 260000 - 320000, Jeffrey Sax
• 2004-12-11: Found n = 281366, Jeffrey Sax
• 2004-05-10: Found n = 206716, James S. Griffin
• 2003-11-12: Found n = 259537, James S. Griffin
• 2003-08-25: Found n = 154397, James S. Griffin
• 2003-08-18: Found n = 230830, James S. Griffin
• 2003-08-18: Found n = 138101, James S. Griffin
• 2003-07-29: Found n = 120342, Steven Harvey
• 2003-07-29: Found n = 118030, Steven Harvey
• 1989: Found n = 58476, Sergio Zarantonello, Joel Smith, Gene Smith, Bodo Parady, Landon Curt Noll, John Brown