+0  
 
+1
205
1
avatar+267 

delete

 Jun 25, 2018
edited by yasbib555  Jun 25, 2018
 #1
avatar+27552 
+1

When the two are equal then n = 6, so n+7 = 2n+1 = 13.  Since 13 is prime this is the gcd.  It is easy to check that smaller values of n result in a gcd of 1.  

 Jun 25, 2018

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