### Number circle

The **number circle** shows the cyclic structure of the natural numbers.

##### Explanation

In the middle is the 0, because it appears both in the unit circle as well as in the number circle. The inner border starts with 1, and continues till 24.

165 166 167 168145 146 147 164 141 142 143 144121 122 123 148 140 117 118 119 12097 98 99 124 116 93 94 95 9673 74 75 100 92 69 70 71 7249 50 51 76 68 45 46 47 4825 26 27 52 44 21 22 23 241 2 3 28 20 4 163 139 115 91 67 43 19 i^{1}5 29 53 77 101 125 149 16213811490664218i^{2}0i^{0}6305478102126150161 137 113 89 65 41 17 i^{3}7 31 55 79 103 127 151 160 136 112 88 64 40 16 8 32 56 80 104 128 152 15 14 13 1211 10 9 39 38 37 3635 34 33 63 62 61 6059 58 57 87 86 85 8483 82 81 111 110 109 108107 106 105 135 134 133 132131 130 129 159 158 157 156155 154 153

There are three types of natural numbers. You can see this in the inner border.

• | 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. All further multiples of 3 are therefore no prime numbers. |

• | 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. Because of this other even numbers are no prime numbers. |

• | The other 8 numbers are 1, 5, 7, 11, 13, 17, 19, 23. These are all prime numbers, with the exception of the number 1. All multiples of these prime numbers are therefore no prime numbers. |

With the prime number cross you can show the prime numbers and clarify the influence they have on all numbers.