19

This number is a prime.

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

The decimal expansion of 19¹⁹ begins with the digits 19. This is not true for p^p, where p is any other prime less than 19,000,000,019. [Caldwell]

19 is the |1 - 9|th prime number. [Caldwell]

19^0 + 19^1 + ... + 19^18 (19 terms) is prime. [Caldwell]