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Williams primes of the form 22•21ⁿ+1

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Current data

Base :	21
Count :	8
Max n :	100,000
Date :	2024-09-09

1^[1], 5, 26^[2], 206, 350, 1547, 1853, 7796

Notes

↑ Twin n=1
↑ Twin n=26

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

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Williams prime PP