At some point a while ago, I was looking for the RBG equivalents of the old ANSI colors from my BBS days.
I found them eventually, copied below for posterity
Name Code RGB Value Name Code RGB Value Black 30 000000 Dark Gray 1;30 555555 Red 31 aa0000 Light Red 1;31 ff5555 Green 32 00aa00 Light Green 1;32 55ff55 Blue 34 0000aa Light Blue 1;34 5555ff Cyan 36 00aaaa Light Cyan 1;36 55ffff Purple 35 aa00aa Light Purple 1;35 ff55ff Brown 33 aa5500 Yellow 1;33 ffff55 Light Gray 37 aaaaaa White 1;37 ffffff
Alternatively:
Name Code RGB Value Name Code RGB Value Black 30 000000 Dark Gray 1;30 444444 Red 31 aa0000 Light Red 1;31 ff4444 Green 32 00aa00 Light Green 1;32 44ff44 Blue 34 0000aa Light Blue 1;34 4444ff Cyan 36 00aaaa Light Cyan 1;36 44ffff Purple 35 aa00aa Light Purple 1;35 ff44ff Brown 33 aaaa00 Yellow 1;33 ffff44 Light Gray 37 aaaaaa White 1;37 ffffff