Riesel primes of the form 21405•2n-1

Current data

k , b : 21405 , 2 Type : 315 Count : 61 Nash : 3703 Max n : 300,000 Date : 2023-04-13

2, 9, 21, 27, 28, 30, 33, 53, 54, 74, 76, 92, 108, 120, 242, 250, 252, 339, 416, 459, 514, 652, 660, 800, 810, 849, 1582, 1613, 1771, 2116, 2402, 2610, 3460, 3779, 5771, 5980, 6402, 6780, 7533, 7582, 14592, 14827, 16046, 18737, 18900, 21196, 23392, 34678, 35494, 36508, 47118, 77321, 87796, 164702, 176038, 181062, 194454, 205796, 214221, 247713, 251836

History

• 2023-04-13: Checked to n = 300000, Alexander Jones, released
• 2023-02-01: Checked to n = 150000, Alexander Jones
• 2023-01-29: Checked to n = 100000, Alexander Jones
• 2023-01-29: Reserved by Alexander Jones
• 2005-11-28: Found n = 214221, Bernardo Boncompagni