Question

What is the sum of all of the two-digit primes that are greater than 12 but less than 99 and are still prime when their two digits are interchanged?

Answer 1

418

Explanation:

The prime numbers are 13, 17, 31, 37, 71, 73, 79, 97

Sum = 13+17+31+37+71+73+79+97 = 418