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 i 5 19 i 5 18 i2 0 −i2 6 or 18 −1 0 1 6 17 −i 7 17 −i 7 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 6n ± 1. These are 1, 5, 7, 11, 13, 17, 19, 23. |
| • | 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.. |