Williams primes of the form 20•21n-1

Current data

Base : 21 Count : 16 Max n : 100,000 Date : 2024-09-09

1, 2, 7, 24, 31, 60, 230, 307, 750, 1131, 1665, 1827, 8673, 27775, 39257, 99102

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
• ?: Checked to n = 512, Steven Harvey