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Williams primes of the form 4•5ⁿ-1

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Current data

Base :	5
Count :	25
Max n :	1,000,000
Date :	2024-08-30

1, 3, 9, 13, 15, 25, 39, 69, 165, 171, 209, 339, 2033, 6583, 15393, 282989, 498483, 504221, 754611, 864751, 1132659, 1292915, 1330541, 3189669, 6181673

Remarks :

The sequence A046865 in OEIS
See Thread at MersenneForum

History

2024-08-30: Reservation dropped, Dylan Delgado
2022-07-15: Found n = 6181673, Ryan Propper
2022-07-12: Found n = 3189669, Ryan Propper
2022-07-11: Found n = 1330541, Ryan Propper
2022-07-11: Found n = 1292915, Ryan Propper
2022-07-11: Found n = 1132659, Ryan Propper
2019-05-11: Reserved by Dylan Delgado
2019-04-04: Checked n = 695000 - 1000000, Karsten Bonath
2019-02-25: Found n = 864751, Karsten Bonath
2019-01-28: Found n = 754611, Karsten Bonath
2019-01-17: Checked n = 320000 - 695000, Karsten Bonath
2019-01-17: Found n = 498483 & 504221, Karsten Bonath
2018-12-07: Checked n = 1 - 320000, Karsten Bonath
2018-12-07: Found n = 282989, Karsten Bonath
2007-12-20: Checked n = 110000 - 200000, Geoffrey Reynolds
2007-07-13: Checked n = 100000 - 110000, Geoffrey Reynolds
2006-09-22: Checked n = 50000 - 100000, Geoffrey Reynolds
2006-07-19: Checked to n = 50000, (antiroach)
2006-07-17: Found n = 15393, (antiroach)
2003-01-26: Checked n = 1 - 8100, Robert G. Wilson
1981: Checked n = 1 - 500, Hugh C. Williams

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Williams prime MM