9547

This number is a prime.

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The largest 4-digit distinct-digit prime (emirp) abcd such that a^a+b^b+c^c+d^d is prime, i.e., 9^9+5^5+4^4+7^7 = 388247413. [Loungrides]

Submitted: 2013-02-14 13:42:56; Last Modified: 2020-07-27 19:27:17.