The numbers aren't important. The ratio between the numbers is what you should be concerned with. 10-5-1 is the same thing as 20-10-2 if you use twice as much. For veg, you want a higher N and lower P, like 10-2-5. For bloom you want lower N, espicially nearing the end. There's really about 3 stages of blooming that should all have different ratios, but a good all around budding ratio is something like 2-10-5.