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Difference between revisions of "Riesel number"
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A '''Riesel number''' is a value of k such that k × 2<sup>n</sup> - 1 is always composite. | A '''Riesel number''' is a value of k such that k × 2<sup>n</sup> - 1 is always composite. | ||
− | Using the same method presented in the [[ | + | Using the same method presented in the [[Sierpiński problem]] article, H.Riesel found in 1956 that 509203 × 2<sup>n</sup> - 1 is always composite. |
− | In order to demonstrate whether 509203 is the smallest Riesel number or not (the '''[[Riesel problem]]'''), a [[ | + | 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]]. |
==See also== | ==See also== | ||
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*[http://mathworld.wolfram.com/RieselNumber.html MathWorld] | *[http://mathworld.wolfram.com/RieselNumber.html MathWorld] | ||
*[[Wikipedia:Riesel number|Riesel number]] | *[[Wikipedia:Riesel number|Riesel number]] | ||
− | [[Category: | + | {{Navbox NumberClasses}} |
+ | [[Category:Number]] |
Revision as of 11:29, 7 March 2019
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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.
See also
External links
Number classes
General numbers |
Special numbers |
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Prime numbers |
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