Who is an inventor of hexadecimal?

Answer 1

People have been using hexadecimal since ancient times. There is no record of who "invented" it. You might as well ask who invented counting. But we know it was used because we do know that the ancient Babylonians were regularly using base 60 (sexagesimal). That's a system we still use today because 60 is so highly divisible, it being the lowest value that has 1, 2, 3, 4, 5 and 6 as factors. We use it to tell the time (60 seconds to the minute, 60 minutes to the hour, two 12 hour periods in a day) and to measure angles (360 degrees in a circle).

Given the ancient Babylonians knew the highly-divisible nature of sexagesimal, it stands to reason they would have been fully aware of other bases, including binary, the most primitive of all the bases. They would also have been fully aware of the very close relationship between binary and all other bases that are themselves a power of 2, including octal (base 8) and hexadecimal (base 16). But as to who invented it -- or rather who discovered it -- we simply do not know.