# 859

This number is a prime.

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The largest 3-digit distinct-digit prime p such that replacing any of its digits with the digit 3, the result is always a prime, i.e., 359, 839, 853. Note that a concatenation of these three primes, i.e., 359853839 is also prime. [Loungrides]
Submitted: 2011-05-20 10:43:09; Last Modified: 2020-02-12 12:32:31.

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