Riesel primes of the form 385•2n-1

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

Current data

k , b : 385 , 2 Count : 31 Nash : 1665 Max n : 3,100,000 Date : 2024-08-15 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 3, 7, 11, 13, 39, 55, 63, 115, 119, 147, 373, 735, 811, 867, 2353, 4479, 4837, 20387, 29691, 36883, 114673, 154563, 214829, 401771, 406815, 424189, 654349, 771627, 1126083, 2189441

History

• 2022-11-01: Found n = 2189441, Stuart Mullage
• 2022-06-03: Reserved by NPLB Drive 16, for 2000000<n<3000000
• 2014-12-28: Checked to n = 2000000, NPLB Maxi Drive 1, released
• 2014-08-20: Reserved by NPLB Maxi Drive 1, for 1610000<n<2000000
• 2013-04-28: Reserved by NPLB Maxi Drive 1, for 1300000<n<2000000
• 2013-03-06: Found n = 1126083, Ian M. Gunn
• 2013-01-14: Reserved by NPLB Maxi Drive 1, for 1000000<n<1300000
• 2009-08-05: Checked to n = 1000000, Ian M. Gunn, released
• 2009-07-20: Checked to n = 967000, Ian M. Gunn
• 2009-06-28: Checked to n = 921000, Ian M. Gunn
• 2009-06-09: Checked to n = 877000, Ian M. Gunn
• 2009-05-25: Checked to n = 841000, Ian M. Gunn
• 2009-05-12: Checked to n = 806000, Ian M. Gunn
• 2009-04-29: Found n = 771627, Ian M. Gunn
• 2009-04-23: Checked to n = 749000, Ian M. Gunn
• 2009-04-11: Checked to n = 709000, Ian M. Gunn
• 2009-03-26: Found n = 654349, Ian M. Gunn
• 2009-03-20: Checked to n = 631000, 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
• 2008-03-28: Found n = 424189, Carlos Eduardo Pinho
• 2008-03-27: Found n = 406815, Carlos Eduardo Pinho
• 2008-03-17: Found n = 401771, Timothy Sorbera
• 2008-03-01: Reserved by NPLB Drive 3, for 260000<n<600000
• 2004-03-23: Found n = 214829, Peter O'braian
• 2003-08-31: Found n = 154563, Peter O'braian
• 2003-02-10: Found n = 114673, Steven Harvey