Palindrome Sum

Niloy opened a channel for Math Olympiad preparation. The number of channel subscribers was $7117$ which is a palindrome number. Niloy added a prime number to the number of subscribers to his channel for fun and found that the sum was also a palindrome number. What is the smallest prime number he could add?

Adhock   Arithmetic  

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Attempt 299

Solve 139

First Solve mollamdkashem22