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# Permutable primes

Permutable primes in a given base ${\displaystyle b}$ are prime numbers which are still prime numbers after some nontrivial permutation of their base ${\displaystyle b}$ digits. For example, in base 10, the prime number 137 is still prime after its digits are permuted to 173 (however, note that 371 is not prime since it's equal to 7 × 53).