313

This number is a prime.

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The smallest half-quartan palindromic prime, i.e., (1^4+5^4)/2 = 313. [Loungrides]

The only non-titanic prime formed by concatenating in ascending order the first n consecutive numbers ending with 3 (n=2). [Loungrides]

The smallest prime such that the reversal of its square (96979) is prime. Note that rev(96979^2) is prime also. [Loungrides]