Full credit to Numberphile for a better explanation of the problem. I like my technique more, though.
   • The problem in Good Will Hunting - Nu...  

Marty Gots a Plan by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Source: http://incompetech.com/music/royalty-...
Artist: http://incompetech.com/

Rhodesia by Twin Musicom is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Artist: http://www.twinmusicom.org/