63 and -7/4 are special - Numberphile Dynamical sequences, prime divisors and special exceptions.
More links & stuff in full description below ↓↓↓
Featuring Dr Holly Krieger from MIT.
More primes: http://bit.ly/primevids
More videos with Holly Krieger: http://bit.ly/HollyKrieger
Since this was filmed, Holly has become a mathemmandelbrot set LINK