3

This number is a prime.

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

3 is the only prime number with a digital root of 3. [McAlee]

There are only 3 non-trivial pseudoprimes less than a hundred (49, 77, 91). [McAlee]

There are only 3 irregular primes less than 100: 37, 59, 67. [McAlee]