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2011-09-20, 22:00
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kar_bon
Mar 2006
Germany
AEC
_{16}
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Quote:
Originally Posted by
firejuggler
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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