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How many prime numbers p exist such that p 2 + 2 is also a prime number?

 Jul 13, 2020
 #1
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How many prime numbers p exist such that p 2 + 2 is also a prime number? 

 

Before I go to the trouble of trying to find an answer, I need to know does p 2 + 2 mean p2 + 2 ? 

 

The first thing you can do is eliminate all even numbers because no even number is prime, except 2. 

 Jul 13, 2020
edited by Guest  Jul 13, 2020
 #2
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I think he means p(2+2) or p^2+2

 

Not sure though.

 Jul 14, 2020

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