Irrational number

Math An irrational number is a number which cannot be expressed as a ratio of 2 integers:

\[\frac{a}{b}\neq n, (a,b)\in\mathbb{Z}\]

Example
&pi; is an irrational number. It does not repeat. However, it is not proven if it is a random sequence of digits. If it is, it is a normal number, which must be an irrational number.