PalPrimes

A palindromic-prime or PalPrime is a prime number that is also a palindrome.The first few PalPrimes are 2,3,5,7,11,101,131,151,181,191...2, 3, 5, 7, 11, 101, 131, 151, 181, 191.... Let SS be the sum of the digits of the largest PalPrime NN such that N<109N<10^9.What is the value of SS?

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