337

This number is a prime.

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(337, 347) is the only pair of 3-digit successive primes, (emirps), ending with the same digit. [Loungrides]

(337, 373) is the only known case of a pair of primes formed by concatenating in order and reverse order the prime factors of a repunit number, R3=111, (111=3*37=37*3). [Loungrides]

The smallest prime (the only emirp) of form a^b+c^d, where the bases are prime and the exponents are composite digits, i.e., 2^8+3^4. [Loungrides]

The only emirp of form a^b + c^d, where the bases are distinct prime digits and the exponents are distinct composite digits, i.e., 2^8+3^4. Alternating the exponents, i.e., 2^4+3^8 we take the prime 6577. [Loungrides]