1373

This number is a prime.

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+ The smallest prime formed by concatenating two double-digit emirps (13, 73). Note that 3137, formed from their reversals, is also prime. [Loungrides]

+ The smallest prime formed by inserting an emirp between the digits of another emirp. [Loungrides]

(There are 2 curios for this number that have not yet been approved by an editor.)

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