263

This number is a prime.

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The smallest Honaker prime that is a balanced prime. It is also the smallest Honaker prime p for which q=p^3+2 is an emirp (q=18191449). [Loungrides]

The only 3-digit prime whose the square, 69169, is a strobogrammatic number. Likely, 263 is the largest known prime with this property. [Loungrides]