Erik... because the solution dont need to be "SPECIFIC, SPECIFIC, SPECIFIC"

I have 3 PWM outputs, each pwm is 5 depth (5 values), each one for one color R, G and B, so there is 125 avaible colors.

Now I want to make a color selector variable.
Each value of the variable will mean a color... combination of 0 to 4 for each RGB color.
To make this, actually I'm using:
COLORVAR divided by 5
Rest of division by 5 is R
Quotient is divided by 5
Rest is G
New quotient is B
Forming the RGB from a single number COLORVAR, which is the selector

Ok this works
beu when R reachs value 4, the next step would be B=1 R=0, so a not smooth transition.
R G B
3 0 0
4 0 0
0 1 0 < Jump from full red to weak blue.

I dont want to a fade between color, I just need a better arrangement for these 125 color I already have, understand?

I'm doing this because I'm a starter, I dont know other better way to do than this or a color table, this is why I'm asking for some better idea or maybe a help, or just a "search for X"

Portuguese resources are very fair, and I dont know the right words to find what I need, commonly a search for the RIGHT answers gives better results.