Mystery Of The Permutable Primes

A prime number pp is a permutable prime if for all permutations of the digits of pp is also prime.

How many 2-digit permutable primes are there?

Details and Assumptions:

  • For example 113, 131 and 311 are all prime and this consists of all the permutations of 113, so they are all permutable primes.

  • Assume that we are only looking at numbers within a base 10 representation.


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