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 05:43:09;   Last Modified: 2020-02-12 06:32:31.
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