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Old 2019-01-06, 20:44   #8
Batalov
 
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Mar 2008
Phi(4,2^7658614+1)/2

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Quote:
Originally Posted by ET_ View Post
Because 2p-2 is even?
Just to state the obvious, what Luigi 'ET_' said:
the people-speak word 'even' means (in math-speak) 'divisible by 2'. No more, no less.


If something is even - it cannot be prime, except if something is '2' itself.
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