Convert HEX to closest X11 Color Number

Question

I\'m looking for a Algorithm/Way to convert given HEX (e.g. #111111 R:0x11, G:0x11, B:0x11) to the closest X11 color number (Terminal is either 88 or 256 colors) using either Py

Answer 1

Go to Wolfram Alpha, type in your hex value i.e. "#acdffa". Go to the section called "Nearest named HTML colors"

I know this isn't code but you did say "algorithm/way".

Cheers