Thread: is it possible
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Old 2020-07-08, 19:34   #11
drmurat
 
"murat"
May 2020
turkey

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Quote:
Originally Posted by carpetpool View Post
Cunningham Chain of the second kind



OP is mentioning a special case of this (k=2, Fermat Primes), there are only finitely such primes as Paul mentioned.
I asked it because if 2^(n) + 1 is prime and 2^(n+1) + 1 can be prime . it means
(2^n) * (2^ (2n) + 1) *(2^ (2n+1) + 1)
gives perfect number
but it is impossible . one of them is devided by 3
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