### Prime number cross

In the **prime number cross** you can include the complex unit circle.

##### Explanation

In the centre is the number 0, as this is the centre of the number circle and of the complex unit circle.

21 22 23 24 1 2 3 21 22 23 24 1 2 3 20 4 20 4 19 i5 19 i5 18 i^{2}0−i^{2}6 or 18 −1016 17 −i7 17 −i7 16 8 16 8 15 14 13 12 11 10 9 15 14 13 12 11 10 9

There are three types of natural numbers.

• | There are 8 numbers with the form 6 |

• | There are 8 multiples of two. These are 2, 4, 8, 10, 14, 16, 20, 22. The number 2 is a prime number because the series starts with it. |

• | There are 8 multiples of three. These are 3, 6, 9, 12, 15, 18, 21, 24. The number 3 is a prime number because the series starts with it.. |