December 19th, 2018, 03:33 AM  #1 
Member Joined: Nov 2012 Posts: 74 Thanks: 1  Direct Proof
It assumes that n = r*s and check whether r is a prime number or not, but why it does not require to check whether s is a prime number. Moreover, the last paragraph says there are at most n2 possible values. What does this sentence mean? Thank you. 
December 19th, 2018, 06:02 AM  #2 
Senior Member Joined: Apr 2014 From: UK Posts: 895 Thanks: 328 
Can you have another go at scanning it in?

December 19th, 2018, 06:29 AM  #3 
Member Joined: Nov 2012 Posts: 74 Thanks: 1 
Sorry, it is my bad. Hope it is better.


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