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Old 2002-11-09, 10:41   #3
TTn
 

2·2,857 Posts
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What would take longer?

(a)The execution of the Lucas-Lehmer test on 2^13466917 -1
or,
(b)Dividing F(2^13466917 -2) by 2^13466917 -1, make sure it is not compostie
?
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