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Williams primes of the form 4•5ⁿ-1

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Current data

Base :	5
Count :	20
Max n :	1,000,000
Date :	2019-04-04

1, 3, 9, 13, 15, 25, 39, 69, 165, 171, 209, 339, 2033, 6583, 15393, 282989, 498483, 504221, 754611, 864751

History

2019-04-04: Checked to n = 1000000, Karsten Bonath
2019-02-25: Found n = 864751, Karsten Bonath
2019-01-28: Found n = 754611, Karsten Bonath
2019-01-17: Found n = 498483 & 504221, Karsten Bonath
2018-12-06: Checked n = 1 - 321000, Karsten Bonath
2007-12-20: Checked to n = 200000, Geoffrey Reynolds
2007-07-13: Checked to n = 110000, Geoffrey Reynolds
2006-09-22: Checked to n = 100000, Geoffrey Reynolds
2006-07-19: Checked to n = 50000, (antiroach)
2006-07-17: Found n = 15393, (antiroach)
1981: Checked to n = 500, Hugh C. Williams

External links

Thread at MersenneForum
The sequence A046865 in OEIS

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Williams prime MM