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Williams primes of the form 19•20ⁿ-1

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Current data

Base :	20
Count :	4
Max n :	20,000
Date :	2019-04-17

1, 219, 223, 3659

History

2019-04-17: Checked to n = 20000, Karsten Bonath
?: Checked to n = 512, Steven Harvey

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Williams prime MM