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Old 2018-03-05, 05:52   #2
S485122
 
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"Jacob"
Sep 2006
Brussels, Belgium

33568 Posts
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On the https://www.mersenne.org : GIMPS site there is a menu item "More Information / Help". In the page "The Maths", residue and shift are explained in the paragraph "Double-Checking" but benefits from the reading of the previous paragraph "Lucas-Lehmer Primality Testing" for better understanding.

Jacob
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