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..... Let S be the sum of the digits of the largest PalPrime N such that N<10^9 . What is the value of S ?

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