Thomas Andrew (Tom) Lehrer (born April 9, 1928) is an American singer-songwriter, satirist, pianist, and mathematician. The guy lip syncing this bit isn't but adds visual comedic value.
FYI: Math base "8" was (is?) used in computer programming in the old days (1980's) when computers were programmed in binary, octal and hexadecimal assembly language.
If you get the following joke, then you know what I'm talking about:
"There are 10 kinds of people in the world. Those who understand binary and those who don't..."