23

This number is a prime.

Just showing those entries submitted by 'Murthy': (Click here to show all)

23 = 3 times the third prime + twice the second prime + once the first prime. [Murthy]

2! + 3! = 2³. [Murthy]

23 = - (2² - 3³). [Murthy]

The smallest prime of form p^p - q^q, where p and q are primes. [Murthy]

(There is one curio for this number that has not yet been approved by an editor.)