0

This number is neither prime nor composite.

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

Zero is the determinant of a 4x4 matrix formed by four consecutive prime quadruplets:

  5    7   11   13 
 11   13   17   19 
101  103  107  109 
191  193  197  199.

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