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Hello there.

This is Numberphile. We mainly post videos about mathematics and just numbers in general.

Big Factorials

Big Factorials

Large factorials and the use of Stirling's Approximation.

Featuring Professor Ken McLaughlin.

Professor McLaughlin is based at Colorado State University: https://www.math.colostate.edu/~kenmcl/

We filmed this during his time at the Mathematical Sciences Research Institute.

69 Factorial: https://www.youtube.com/watch?v=kw6l_uTakRA

Twin Proofs for Twin Primes

Twin Proofs for Twin Primes

The Reciprocals of Primes

The Reciprocals of Primes