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There's a question that I'm not quite sure how to solve, I know it involves factoring but I don't know how to prove the statement:

 

Prove that 4 is the only perfect square that is one more than a prime number

 

Keep in mind the goal is not to try and find out if 4 is the only perfect square that is one more than a prime number, it's to prove how.

 
 Jan 13, 2021
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https://web2.0calc.com/questions/prime-one-less-than-a-square

 
 Jan 13, 2021

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