184

This number is a composite.

+ 184 = 23 * 23 (concatenation of the first two primes). [Sladcik]

+ The smallest number that can be written as q * pq + r * p r, where p, q and r are distinct primes (184 = 3 * 23 + 5 * 25). [Thoms]

+ 2184 with the last digit removed is prime. [Blevins]

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

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