338323

This number is a prime.

The smallest prime of the form p^q + q^r + r^p where p, q and r are different primes: 3^11 + 11^5 + 5^3 = 338323. By accident, 3^5 + 5^11 + 11^3 = 48829699 turns out to be prime also. [Koymans]