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How many two digit prime numbers are there in which both digits are also prime numbers? (For example, 23 is one of these, but 31 is not because 1 is not a prime number)

 

Need answer AND explination as soon as possible please!!!! Thank you!!!!!

Trinityvamp286  Jul 17, 2017

Best Answer 

 #1
avatar+26102 
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There are 4 of them:

 

23 37 53 73 

 

The others have either a 1 or a 9 or an even number (>2) in them.

Alan  Jul 17, 2017
edited by Alan  Jul 17, 2017
edited by Alan  Jul 17, 2017
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1+0 Answers

 #1
avatar+26102 
+1
Best Answer

There are 4 of them:

 

23 37 53 73 

 

The others have either a 1 or a 9 or an even number (>2) in them.

Alan  Jul 17, 2017
edited by Alan  Jul 17, 2017
edited by Alan  Jul 17, 2017

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