Proth primes of the form 831•2n+1

Current data

k , b : 831 , 2 Type : 3 Count : 33 Nash : 2035 Max n : 3,640,000 Date : 2022-07-31

1, 4, 9, 27, 45, 99, 195, 580, 709, 717, 747, 892, 1309, 2197, 2740, 3700, 6667, 7501, 9345, 12820, 14563, 17659, 42547, 76777, 103365, 162043, 189573, 233539, 338605, 361161, 398905, 903717, 2235253

History

• 2022-07-31: Checked to n = 3322000, PrimeGrid Proth Prime Search
• 2019-07: Checked n = 3322000-3640000, PrimeGrid Proth Mega Prime Search
• 2013-05-12: Found n = 2235253, Serge Batalov
• 2010-09-26: Found n = 903717, Ruediger K. Eckhard
• 2008-03-07: Found n = 338605, Steven Harvey
• 2008-02-08: Found n = 361161, Steven Harvey
• 2007-10-13: Found n = 398905, Steven Harvey
• 2005-07-14: Found n = 233539, Steven Harvey
• 2005-03-18: Found n = 189573, Steven Harvey
• 2002-01-29: Found n = 162043, Anton Oleynick
• 2001-11-24: Found n = 103365, Anton Oleynick
• 1997-12-23: Found n = 17659, James Carpenter
• 1996-03: Found n = 6667, Patrick Demichel
• 1993: Found n = 9345, Harvey Dubner
• 1993: Found n = 7501, Harvey Dubner