W3 page on Color Standards X11 shows a 1-99 breakdown that I am familiar with over at Xxxxx (name redacted as advertising not welcomed). Namely, every Primary color can be applied using a fixed "primary" Hexadecimal stepping system. That system counts up using "primary" increments. Those increments diversify without color names.
https://www.w3schools.com/colors/colors_x11.asp
The W3 Schools page uses primary increments, but only for grey-scale. Here are the primary units for all colors.
11 22 33 44 55 66 77 88 99 AA BB CC DD EE FF
X11 leans on photographic deployment of oi