Level and experience

Already in Procrastination I came up with a function form for calculating how experience needed for each level. Basically it uses a second experience variable that will have a value depending on level subtracted from a fixed value that is set as soon as that value is reached, that fixed value is the experience needed to reach the first level (e.g. level 2). The function to calculate the value to subtract is level to the power of X times multiplier plus another value where X should be a small value higher than 1, the multiplier is just to make the numbers more interesting and final value is just to make the second level up more interesting than the first if the X value is very close to 1. For procrastination I use:
lvl^1.1 * 250 + 100, and the first level at 100
In irresponsibility I use:
lvl^1.7 * 100, and first level at 200
With each enemy giving a multiple of 250 experience per stage this gives slightly more than 1 level per monster at the first 3 stages but decreasing for each stage (comparing one stage to 1 level which is of course very inaccurate). More accurately all characters should reach level 2 after stage 1, level 4 after stage 2, level 10 after stage 5, level 18 after stage 10, level 38 after stage 20 and level 55 after stage 30. Level 100 should be reached around stage 65, so far I only plan to have 30 stages though but every stage should be able to be replayed at any time. Monster will be approximated to this list, e.g. a monster at stage 1 should be level 1, monsters at level 5 should be between level 8 and 12 and monsters at level 30 should be between level 50 and 60.