Thread: k=43112609
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Old 2011-09-20, 22:00   #10
kar_bon
 
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Mar 2006
Germany

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Quote:
Originally Posted by firejuggler View Post
I also checked the counterpart of every +1 prime.
No -1 is prime
k*2^n-1 and k*2^n+1 (k>1) both primes (so twins) -> k == 0 mod 3.
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