| Currently there may be errors shown on top of a page, because of a missing Wiki update (PHP version and extension DPL3). |
Navigation
| Topics | Help • Register • News • History • How to • Sequences statistics • Template prototypes |
Williams prime MM 5
Definition
Primes of the form [math]\displaystyle{ 4 \cdot 5^n-1 }[/math].
Data
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 | Geoff Reynolds checked to n=200000 |
| 2007-07-13 | Geoff Reynolds checked to n=110000 |
| 2006-08 | Found n=15393, antiroach |
| 1981 | Found n=1 ... 339, checked to n=500, H. C. Williams |
