14

This number is a composite.

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

14 is the smallest semiprime whose reversal is a prime. [Gupta]

The smallest impossible value of Euler's Phi function. [Gupta]

1!*2!*3!*4!*5!*6!*7!*8!*9!*10!*11!*12!*13!*14! + 1 is prime. [Gupta]

14^14 plus the 14th prime is prime. Other smaller examples are 1, 2 and 4. [Gupta]