Prime Curios!: 237

237
(another Prime Pages' Curiosity)

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2^(237 - 1) + 237 is prime. [Zeisel]

237 is the smallest 3-digit number with its digits being 3 distinct primes that is not prime nor any of the permutations of its digits represent a prime number. [Sladcik]

(There is one curio for this number that has not yet been approved by an editor.)