Riesel primes of the form 383•2n-1

Reserved! This sequence is currently part of Multi Reservation 26: NPLB Drive 19.

Current data

k , b : 383 , 2 Count : 39 Nash : 1926 Max n : 3,100,000 Date : 2024-08-15 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

2, 8, 12, 16, 38, 46, 52, 120, 136, 242, 252, 296, 326, 556, 736, 978, 1018, 3950, 4046, 5898, 6440, 7906, 14012, 22682, 28212, 42120, 50692, 76312, 99148, 106852, 159180, 160258, 172968, 285892, 608340, 736876, 1091332, 1716780, 1794636

History

• 2023-03-07: Reserved by NPLB Drive 19, for 3000000<n<4000000
• 2023-03-07: Checked to n = 3000000, NPLB Drive 16, released
• 2022-06-03: Reserved by NPLB Drive 16, for 2000000<n<3000000
• 2014-12-28: Checked to n = 2000000, NPLB Maxi Drive 1, released
• 2014-10-19: Found n = 1794636, Lennart Vogel
• 2014-09-20: Found n = 1716780, Göran Schmidt
• 2014-08-20: Reserved by NPLB Maxi Drive 1, for 1610000<n<2000000
• 2013-04-28: Reserved by NPLB Maxi Drive 1, for 1300000<n<2000000
• 2013-02-24: Found n = 1091332, Stuart Mullage
• 2013-01-14: Reserved by NPLB Maxi Drive 1, for 1000000<n<1300000
• 2009-08-14: Checked to n = 1000000, Ian M. Gunn, released
• 2009-07-20: Checked to n = 960000, Ian M. Gunn
• 2009-06-28: Checked to n = 917000, Ian M. Gunn
• 2009-06-09: Checked to n = 877000, Ian M. Gunn
• 2009-05-25: Checked to n = 844000, Ian M. Gunn
• 2009-05-12: Checked to n = 812000, Ian M. Gunn
• 2009-04-23: Checked to n = 761000, Ian M. Gunn
• 2009-04-15: Found n = 736876, Ian M. Gunn
• 2009-04-11: Checked to n = 725000, Ian M. Gunn
• 2009-03-20: Checked to n = 662000, Ian M. Gunn
• 2009-03-08: Found n = 608340, Ian M. Gunn
• 2009-03-08: Reserved by Ian M. Gunn, for 600000<n<1000000
• 2008-11-10: Checked to n = 600000, NPLB Drive 3, released
• 2008-03-06: 285892 confirmed, James P. Burt
• 2008-03-01: Reserved by NPLB Drive 3, for 260000<n<600000
• 2005-01-06: Found n = 285892, Peter O'braian
• 2004-02-22: Found n = 172968, Peter O'braian
• 2004-02-22: Found n = 160258, Peter O'braian
• 2004-02-22: Found n = 159180, Peter O'braian
• 2001-03-07: Found n = 106852, Kimmo Herranen
• 2001-03-07: Found n = 99148, Kimmo Herranen
• 2001-03-07: Found n = 76312, Kimmo Herranen