1249

This number is a prime.

The smallest 4-digit prime p such that p^3 ends with p. [Russo]

The smallest emirp p such that p^p ends in p and p is not congruent to 1 (mod 10). [Post]

First prime of the form 2*k^n-1, where k=5. [Luen]

The Hartenfels Castle was first mentioned in old writings in 1249. [Eds]