method to create random colors according to some sets

In my javascript file, i have a set of couples eache constituted by a letter and a number, for exemple : {(A,5), (B,7), ..., (Z,3)}.

For every couple (A,x) I have x divs in my html with a style = "background-color: {{object.color}}".

I'd like to write a method that randomly computes x colors for each couple (A,x) such that :

• each color is enough different from the others to distinguish all of them.
• every colors of a same couple are enough close to identify this couple.

For exemple : I have this couples : {(A,5), (B,4), (C,10)} so I have 19 divs in my html. For all 5 divs of set A I compute a color of blue tint, for all 4 divs of set B I compute a color of green tint, and for all 10 divs of set C I compute a color of red tint.

Of course you don't know the couples by advance :)

Is there a way to do that maybe using the RGB value of each color on css or something like this ?

Thanks for your attention.