On the webpage where you enter the answer to this puzzle it says: 1, 15, 30, 36, 51.
If you can hold the book so that you can just see the bottom left of just those pages you can see how the dot has moved.
What the 1, 15, 30, 36, 51 have to do with anything. If you look at them closely, they don't match the apex points of the dot trail. It should be 1, 14, 27, 40, 53 if that was the purpose of the sequence.
Nevertheless, the answer is below. DO NOT CLICK IF YOU DO NOT WANT TO KNOW THE ANSWER!!