PUZZLET 048

Manipulating Primes

To find all 4-digit primes which remain prime for all left and right truncations. The truncations of, say, 2397 produce all of the following: 2, 7, 23, 97, 239, 397. Don't forget - 1 isn't a prime number, but 2 is!

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Last Updated: January 11th, 2010.