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Riesel primes of the form 781•2ⁿ-1

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Reserved! This sequence is currently part of Multi Reservation 3: NPLB Drive 18.

Current data

`k` , `b` :	781 , 2
Count :	27
Nash :	1567
Max `n` :	2,170,000
Date :	2024-04-02
Reserved :	No Prime Left BehindNo Prime Left Behind/Reserved

3, 9, 27, 29, 45, 221, 315, 381, 875, 1175, 1773, 2223, 20907, 21465, 21525, 58665, 63537, 88925, 114681, 118085, 204887, 254331, 320757, 978597, 1378671, 1894473, 1993173

History

2023-01-21: Reserved by NPLB Drive 18, for 2000000<n<3000000
2023-01-21: Checked to n = 2000000, NPLB Drive 14, released
2023-01-19: Found n = 1993173, Max Dettweiler
2022-12-26: Found n = 1894473, Max Dettweiler
2014-11-25: Found n = 1378671, Lennart Vogel
2011-12-31: Reserved by NPLB Drive 14, for 1000000<n<=2000000
2011-02-08: Checked to n = 1000000, NPLB Drive 6, released
2011-01-12: Found n = 978597, Brian Lody
2008-12-22: Checked to n = 600000, NPLB Drive 1, released
2008-12-19: Reserved by NPLB Drive 6, for 600000<n<=1000000
2008-03-25: Checked to n = 333200, NPLB Drive 2, released
2008-01-22: Reserved by NPLB Drive 2, for 260000<=n<=333200
2008-01-21: Reserved by NPLB Drive 1, for 333201<=n<=600000
2005-10-27: Found n = 254331, Steven Harvey
2005-02-03: Found n = 204887, Steven Harvey
2003-04-30: Found n = 118085, Steven Harvey
2003-04-30: Found n = 114681, Steven Harvey

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