218

This number is a composite.

218 = 7² + 13². Note that 7 and 13 are the smallest primes for which there is no easy divisibility check in base 10. [Pfannerer]

Smallest n not congruent to 1 mod 3 such that there are no known primes of the form 2*n^k+1. [Luen]

The smallest Honaker number that is an anagram of a smaller Honaker number (182). [Gaydos]