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What is the largest two digit prime number whose digits are both

prime numbers?

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I will be happy to critique your thinking.

well i know it has to begin and end with a 1,3,4,5, or 7.but i dnt know at to do after...

well i know it has to begin and end with a 1,3,4,5, or 7.but i dnt know at to do after

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