New Largest Known Prime Number

There is a new "largest known prime number".

Extra footage: http://youtu.be/o0ZOs7sMS7k

More on Mersenne Primes: http://www.youtube.com/watch?v=PLL0mo5rHhk
Perfect Numbers: http://www.youtube.com/watch?v=ZfKTD5lvToE
Googolplex: http://www.youtube.com/watch?v=8GEebx72-qs
Graham's Number: http://www.youtube.com/watch?v=XTeJ64KD5cg

This video features Dr Tony Padilla from the University of Nottingham.