tput setaf color table? How to determine color codes?

I am in the process of colorizing my terminal’s PS1. I am setting color variables using tput; for example, here’s purple: PURPLE=$(tput setaf 125) ### Question: How do I find the color codes (e.g. 125) of other colors? Is there a color table guide/cheat sheet somewhere? I’m just not sure what 125 is … Is there some way to take a hex color and convert into a number that setaf can use?