XPTable proof

This is the actual (obfuscated) code that calculates the level requirements in runescape:
    //int i1 = 0;
    //for (int i2 = 0; (i2 ^ 0xFFFFFFFF) > -121; ++i2)
    //{
    //  int i3 = 1 + i2;
    //  int i4 = (int)(i3 + Math.pow(2.0D, i3 / 7.0D) * 300.0D);
    //  i1 += i4;
    //  a[i2] = (i1 / 4);
    //}
a[] is an array of integers with the size 99 so that contains the field containing the requirements.
If you know how bitwise operators and doubles/integers work you can change it to this method without affecting the result:
    //int totalXPIndicator = 0;
    //for (int level = 0; level < 120; level++) {
    //  totalXPIndicator += (int)(1 + level + Math.pow(2D, (1 + level) / 7D) * 300D);
    //  levelXPArray[i2] = (totalXPIndicator / 4);
    //}
Now to change it in an working method:
	public int xpTable(final int level) {
		int totalXPIndicator = 0;
		for (int level2 = 1; level2 < level; level2++) {
			totalXPIndicator += (int) (level2 + Math.pow(2D, level2 / 7D) * 300D);
		}
		return totalXPIndicator / 4;
	}