Williams primes of the form 20•21n+1

Current data

Base : 21 Count : 22 Max n : 100,000 Date : 2024-09-09

1, 2, 3, 4, 12, 17, 38, 54, 56, 123, 165, 876, 1110, 1178, 2465, 3738, 7092, 8756, 15537, 19254, 24712, 35002

History

• 2024-09-09: Checked n = 2 - 100000, Mark Rodenkirch, double-check, released
• 2024-08-19: Reserved by Mark Rodenkirch for n = 2 - 100000 double-check
• 2020-11-19: Checked n = 25000 - 100000, Paul Vanderveen
• 2018-03-17: Checked n = 1 - 25000, Eric Chen
• 2016: Checked n = 1 - 1000, Mauro Fiorentini