Fortunately, this code has little to do with maths, except perhaps counting. This is a dictionary or book code. You use the numbers to find specific letters within the poem, and those letters give you the answer.
The number string is split into two lines; one line per word. So there are two words to find.
Within those two lines, the numbers are double digits. So the first two numbers, 01, are the same number - one.
Then, the numbers are used in pairs. So the first two numbers - 01 and 13 - are connected. Using those two numbers together will help you find the answer.
The first number in the pair, 01, was the line of poem it was referring to. The second number was the letter in that line that you needed. So, line 01, letter 13, gives us 'M'. It'd probably help if you retyped the poem.
After finding all the letters using this method, you were left with two words - 'MISTER' and 'MERCURY'. Doing a person search on MySpace for 'Mister Mercury' (with the space) brought up the profile of a 19-year-old male living in Japan with a love letter for a photo.
Clicking on him led you to a mysterious blue profile, and if you looked at his image gallery, you'd find the next pages.