The Four 4S - Numberphile

The Four 4s - Numberphile

The Four 4s (extra footage)

Connect Four - Numberphile

The Four 4s - but every time they say "4" it gets 4% faster

The Four Color Map Theorem - Numberphile

The Puzzling Fourth Dimension (and exotic shapes) - Numberphile

A Colorful Unsolved Problem - Numberphile

Four 4s Challenge - Make 1-20 with only four 4s

four 4s Challenge

RethinkMathTeacher

Four Color Theorem (extra footage) - Numberphile

Four 4’s explained

Jonathan Gaspardis

Incredible Formula - Numberphile

The Four 4s Challenge

Perfect Shapes in Higher Dimensions - Numberphile

The One About the Four 4's!

The Reciprocals of Primes - Numberphile

Concatenation (extra footage) - Numberphile

Four Fours

Can you solve the Four Fours Challenge?

Teach Wonderful

Friends and Strangers Theorem - Numberphile