Riesel primes of the form 3981•2n-1

Current data

k , b : 3981 , 2 Type : 3 Count : 64 Nash : 2965 Max n : 540,000 Date : 2014-10-15

2, 3, 6, 9, 13, 14, 17, 26, 30, 39, 47, 49, 61, 67, 89, 126, 170, 191, 330, 443, 561, 566, 597, 773, 817, 849, 1086, 1274, 1631, 1997, 2106, 2186, 2523, 3194, 3282, 3753, 4786, 5094, 5831, 11674, 13153, 17843, 17903, 20099, 27583, 35701, 38210, 42290, 45699, 53014, 110399, 148327, 160734, 245743, 252522, 263751, 267254, 473783, 481407, 505970, 1292566, 1294922, 1322239, 1353819

History

• 2016-08-02: Found n = 1353819, James P. Burt
• 2016-07-19: Found n = 1322239, James P. Burt
• 2015-06-03: Found n = 1294922, James P. Burt
• 2015-06-02: Found n = 1292566, James P. Burt
• 2014-10-16: Checked n = 400000 - 540000, Karsten Bonath, tested missing pairs
• 2014-08-04: Checked n = 200000 - 400000, Karsten Bonath
• 2012-05-08: Checked to n = 200000, Oscar Tutusaus Santandreu
• 2010: Checked n = 400000 - 540000, Free-DC Drive 1
• 2010-10-07: Found n = 481407, (Oddball), Twin Prime Search
• 1999-01-26: Found n = 13153, Andrew Walker