I kind of feel stupid asking this, but I can't figure it out.
What I'm looking for is a function that incrementally flattens out at specific points.
y = x/100 is fine for the first 10 y, but after that a single point of y will require 200 points.
Then at y = 20 the rate increases again to 300 x per y. At 30 it increases to 400, at 40 to 500, etc.
Technically what I'm looking for is a step function that increments only when the threshold is reached, but I can take care of that afterwards using rounding.
What sort of function would have behaviour like this?