| 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 |
Riesel number
|
This article is only a stub. You can help PrimeWiki by expanding it. |
A Riesel number is a value of k such that k × 2n - 1 is always composite.
Using the same method presented in the Sierpiński problem article, H.Riesel found in 1956 that 509203 × 2n - 1 is always composite.
In order to demonstrate whether 509203 is the smallest Riesel number or not (the Riesel problem), a distributed computing project was created named Riesel Sieve.
