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There are two different two-digit primes such that reversing their digits yields twice a perfect square. Find the sum of these two primes.

 Sep 30, 2019
 #1
avatar+19832 
+3

89 and 23 by looking at list of primes.

89+23

 Sep 30, 2019
 #2
avatar+2417 
+2

I would just list the squares and double it and then reverse their digits too see if they are prime.

 

But looking at a list of primes, if available, is good too!

CalculatorUser  Sep 30, 2019
edited by CalculatorUser  Sep 30, 2019
 #3
avatar+33 
0

Thanks!!!

 Oct 1, 2019

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