Riesel primes of the form 555•2n-1

Reserved! This sequence is currently part of Multi Reservation 8: NPLB Drive 17.

Current data

k , b : 555 , 2 Type : 315 Count : 57 Nash : 2701 Max n : 2,820,000 Date : 2024-03-09 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 7, 9, 12, 24, 27, 30, 31, 43, 67, 150, 238, 282, 307, 357, 694, 793, 909, 918, 1101, 1272, 1437, 1758, 1999, 3957, 4417, 4704, 5841, 5931, 10177, 15024, 17443, 18984, 19537, 28167, 33229, 34759, 90411, 91045, 137739, 144910, 155511, 161994, 169815, 182421, 209293, 212877, 312418, 467419, 471517, 516529, 536460, 686694, 1029045, 1395429, 1414837, 1591677

History

• 2022-08-10: Checked to n = 2000000, NPLB Drive 13, released
• 2022-08-09: Reserved by NPLB Drive 17, for 2000000<n<3000000
• 2019-02-24: Found n = 1591677, Ricky L. Hubbard
• 2015-06-12: Found n = 1414837, Timothy Sorbera
• 2015-01-20: Found n = 1395429, Timothy Sorbera
• 2011-08-26: Found n = 1029045, Göran Schmidt
• 2011-08-04: Reserved by NPLB Drive 13, for 1000000<n<2000000
• 2010-11-11: Checked to n = 1000000, NPLB Drive 5
• 2009-05-20: Found n = 686694, David James
• 2008-12-22: Checked to n = 600000, NPLB Drive 1
• 2008-12-19: Reserved by NPLB Drive 5, for 600000<n<1000000
• 2008-10-25: Found n = 536460, Gary Barnes
• 2008-08-09: Found n = 516529, Gary Barnes
• 2008-06-06: Found n = 471517, James P. Burt
• 2008-06-03: Found n = 467419, James P. Burt
• 2008-03-25: Checked to n = 333200, NPLB Drive 2
• 2008-01-22: Reserved by NPLB Drive 2, for 260000<=n<=333200
• 2008-01-21: Reserved by NPLB Drive 1, for 333201<=n<=600000
• 2004-12-02: Found n = 212877, Steven Harvey
• 2004-12-02: Found n = 209293, Steven Harvey
• 2004-08-30: Found n = 182421, Steven Harvey
• 2004-06-14: Found n = 169815, Steven Harvey