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Williams prime MM 5

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Revision as of 14:35, 7 March 2019 by Karbon (talk | contribs) (updated)
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Definition

Williams prime (b-1)× bn-1 with b = 5 (primes of the form 4 × 5n-1, n ≥ 1).

Prime for n

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

Search range

n = 905000 (2019-03-07)

History

Date Remark
2019-02-23 found n = 864751, Karsten Bonath
2019-01-27 found n = 754611, Karsten Bonath
2018-12-24 found n = 504221, Karsten Bonath
2018-12-23 found n = 498483, Karsten Bonath
2018-12-06 Checked to n = 1 - 321000, found n = 282989, Karsten Bonath
2007-20-12 Checked to n = 200000, Geoff Reynolds
2007-07-13 Checked to n = 110000, Geoff Reynolds
2006-08 Found n = 15393, antiroach
1981 Checked to n = 500, found n = 1 ... 339, H. C. Williams

External links