Find the smallest prime palindrome greater than or equal to
Recall that a number is prime if it's only divisors are 1 and itself, and it is greater than 1.
For example, 2,3,5,7,11 and 13 are primes.
Recall that a number is a palindrome if it reads the same from left to right as it does from right to left.
For example, 12321 is a palindrome.
Input: n = 6 Output: 7
Input: n = 8 Output: 11
Input: n = 13 Output: 101
1 <= n <= 108
2 * 108.