Williams primes of the form 22•21n-1

Current data

Base : 21 Count : 18 Max n : 100,000 Date : 2024-09-09

1, 8, 13, 26, 355, 985, 1347, 1918, 1968, 2802, 3310, 8113, 8728, 10906, 15042, 24051, 36359, 48512

History

• 2024-09-09: Checked n = 2 - 100000, Mark Rodenkirch, double-check n = 2 - 25000, released
• 2024-08-19: Reserved by Mark Rodenkirch for n = 2 - 100000
• 2018-03-17: Checked n = 1 - 25000, Eric Chen
• 2016: Checked n = 1 - 1000, Mauro Fiorentini