Find the smallest integer n that makes 11 x 14^n + 1, a prime number, or, prove that it doesn't exist.

(In reply to incomplete solu by phi)

Phi, your approach (by induction), unfortunatelly, lead us to prove that the number (14*P - 13 (when P is a prime) is not a prime, and so the induction doesnīt hold for (n+1).

I  canīt see (yet) how to prove it.

Maybe, someone who reads your comment or mine, succeed in this proof. 

  

 

Posted by pcbouhid on 2005-06-21 16:55:39