Forum:Experience Points Formula?

HI, when looking at the Experience Points section of Borderlands I noticed a formula for working out the XP needed to get to certain levels. With the DLC increasing the level cap I was wondering if anyone could explain it to me?

Formula: f(x)=60*(x**2.8-1), with x denoting the level and rounding to the next integer (e. g. 3788.1 becomes 3789)