Williams primes of the form 21•22n+1

Current data

Base : 22 Count : 12 Max n : 200,000 Date : 2024-11-04

1, 9, 53, 261, 1491, 2120, 2592, 6665, 9460, 15412, 24449, 128512

History

• 2024-11-04: Checked n = 100000 - 200000, Richard Kapek, released
• 2024-10-19: Reserved by Richard Kapek for n = 100000 - 200000
• 2024-09-10: 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