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Difference between revisions of "Williams prime MM 5"
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==Definition== | ==Definition== | ||
| − | [[Prime | + | [[Prime]]s of the form <math>4 \cdot {5^n{-}1}</math>, ''n'' ≥ 1. |
==Primes for ''n''== | ==Primes for ''n''== | ||
Revision as of 09:26, 5 February 2019
| Reserved! This sequence is currently reserved by: User:Karbon |
Definition
Primes of the form [math]\displaystyle{ 4 \cdot {5^n{-}1} }[/math], n ≥ 1.
Primes for n
1, 3, 9, 13, 15, 25, 39, 69, 165, 171, 209, 339, 2033, 6583, 15393, 282989, 498483, 504221, 754611
Search range
765000 (2019-01-30)
History
| Date | Remark |
|---|---|
| 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 |
