Thread: is it possible
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Old 2020-07-08, 16:25   #7
sweety439
 
Nov 2016

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Quote:
Originally Posted by drmurat View Post
is it possible ( 2 ^ n ) +1 and ( 2 ) ^ ( n + 1 ) + 1 can be prime
k*2^n+1 and k*2^(n+1)+1 can be both prime only for k divisible by 3, or one of these two numbers will be divisible by 3.
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