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Williams primes of the form 19•20ⁿ-1

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Current data

Base :	20
Count :	4
Max n :	25,000
Date :	2018-03-09

1, 219, 223, 3659

History

2018-03-09: Checked to n = 25000, Eric Chen
?: Checked to n = 512, Steven Harvey

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Williams prime MM