In mathematics, natural numbers, also known as counting numbers, are either the set positive integers (1, 2, 3, …) or the set of non-negative numbers (0, 1, 2, …). The set of natural numbers are usually denoted **N** or .

In mathematics, natural numbers, also known as counting numbers, are either the set positive integers (1, 2, 3, …) or the set of non-negative numbers (0, 1, 2, …). The set of natural numbers are usually denoted **N** or .