I was wondering if anyone could help me understand the skill levels and character level needed for that skill level.

So far I know:
Skill 1 - 75 Level needed 1-9
skill 76 - 150 Level needed 10-19
skill 151 - 225 level needed 20-34
skill 226 + level needed 35

Is there a certain level you can train to once at level 35 and if so what is the next level for progression to a higher skill.

Thanks.