13 is already prime. It doesn't need a rainbow.
Wiki User
∙ 9y agoA factor rainbow for 13 would look like this: 13 = 1 x 13.
13 is not a factor of 126.
Yes, 13 is a prime factor.
First, look for a factor. The most obvious would be 5, because the number ends in a five, so must be divisible by 5. 65/5 = 13, so the other factor will be 13. So 65 / \ 5 13 and since both 5 and 13 are prime numbers, the tree can't go on any further.
XIII
Multiples of 13
13 is already prime. It doesn't need a rainbow.
12
65 / \ 13 5
26 / \ 2 13
13 is already prime. It doesn't need a tree.
3 * 13 (both prime numbers)
Multiples of 13, like 13, 26 and 39.
52 / \ 26 2 / \ 13 2 Kind of like that I think. Just get down to prime numbers
Multiples of 13 like 13, 26, 39 and so on.
It can be. 13 is a factor of 26.
13 is not a factor of 126.
65 is a multiple of 13. 13 is a factor of 65. The work is to divide 13 into 65. If the result is an integer, 13 is a factor.