<    1      2      3      4    >

---

Even or odd number

Natural numbers can be divided into even and odd numbers.

 

---

Explanation

The natural numbers can be ordered in several ways.

Natural numbers	Even numbers	Special case: 0
		Composite numbers	Squares of even numbers Numbers not perfect squares
		Only prime number: 2
	Odd numbers	Prime numbers	4n + 1 primes 4n + 3 primes
		Composite numbers	Squares of odd numbers Numbers not perfect squares
		Special case: 1

 

---

Deutsch   Español   Français   Nederlands   中文   Русский