User blog comment:Belthazar451/Number crunching: Food, Glorious Food/@comment-5832451-20130524041917/@comment-7326455-20130524045517

Actually, lvl X -> lvl(X+1) is exactly equal to  lvl(1) -> lvl(X) + lvl(1). Mathematically, to get from level X to level X+1 it's F = A*2^X, where A = 10 for one- and two-element monsters, 20 for three-element monsters, and 30 for four-element monsters, and for a series of the form A*2^x, S(X) = S(X-1)+S(1), where S(n) is the sum of all the values from 1 to n. Powers of two FTW.