1 1.000 root
2 1.059 b2nd
3 1.122 2nd
4 1.189 min3rd
5 1.260 3rd
6 1.335 4rth
7 1.414 b5th
8 1.498 5th
9 1.587 aug5th
10 1.682 6th
11 1.782 min7th
12 1.888 7th
13 2.000 octave

Octave = 2/1
Perfect fifth = 3/2
major third = 5/4
major sixth = 5/3
Perfect fourth = 4/3

Divide Octave
12
19
53