Convert hex to 8 bit colors.

convert.js

const table = [
'073642',
'dc322f',
'859900',
'b58900',
'268bd2',
'd33682',
'2aa198',
'eee8d5',
'002b36',
'cb4b16',
'586e75',
'657b83',
'839496',
'6c71c4',
'93a1a1',
'fdf6e3',
'fdf6e3'
]


// color = (r*6/256)*36 + (g*6/256)*6 + (b*6/256)
function convert256(item) {
	let str = item;
	let redHex = str.substring(0, 2);
	let greenHex = str.substring(2, 4);
	let blueHex = str.substring(4);
	let red = parseInt(redHex, 16);
	let green = parseInt(greenHex, 16);
	let blue = parseInt(blueHex, 16);
	let color = 16 + Math.floor(red*6/256)*36 + Math.floor(green*6/256)*6 + Math.floor(blue*6/256)
	console.log(Math.floor(color));
}

table.forEach(convert256);