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Difference between revisions of "Williams prime MM 5"
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==Definition== | ==Definition== | ||
| − | [[Prime number|Primes]] of the form <math>4 \cdot 5^n-1</math>. | + | [[Prime number|Primes]] of the form <math>4 \cdot {5^n{-}1}</math>. |
| − | == | + | ==Primes for ''n''== |
| − | Primes for ''n'' | + | 1, 3, 9, 13, 15, 25, 39, 69, 165, 171, 209, 339, 2033, 6583, 15393, 282989 |
| − | |||
==Search range== | ==Search range== | ||
| Line 21: | Line 20: | ||
|2007-07-13||Checked to ''n''=110000, Geoff Reynolds | |2007-07-13||Checked to ''n''=110000, Geoff Reynolds | ||
|- | |- | ||
| − | |2006-08||Found n=15393, antiroach | + | |2006-08||Found ''n''=15393, antiroach |
|- | |- | ||
|1981||Found ''n''=1 ... 339, checked to ''n''=500, [http://matwbn.icm.edu.pl/ksiazki/aa/aa39/aa3912.pdf H. C. Williams] | |1981||Found ''n''=1 ... 339, checked to ''n''=500, [http://matwbn.icm.edu.pl/ksiazki/aa/aa39/aa3912.pdf H. C. Williams] | ||
Revision as of 08:08, 13 December 2018
| Reserved! This sequence is currently reserved by: User:Karbon |
Definition
Primes of the form [math]\displaystyle{ 4 \cdot {5^n{-}1} }[/math].
Primes for n
1, 3, 9, 13, 15, 25, 39, 69, 165, 171, 209, 339, 2033, 6583, 15393, 282989
Search range
321000 (2018-12-07)
History
| Date | Remark |
|---|---|
| 2018-12-07 | 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 | Found n=1 ... 339, checked to n=500, H. C. Williams |
