Find the smallest prime palindrome greater than or equal to N. 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. Example 1: Input: 6 Output: 7 Example 2: Input: 8 Output: 11 Example 3: Input: 13 Output: 101 Note: 1 <= N <= 10^8 The answer is guaranteed to exist and be less than 2 * 10^8.