A **permutable prime** (also known as a **chickens prime**) is a type of prime number that remains prime when its digits are permuted in any order. In other words, any rearrangement of the digits of a permutable prime must also be a prime number. For example, the number 197 is a permutable prime because: - 197 is prime, - 179 is prime (a permutation of the digits), - 791 is prime (another permutation).
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