Why is pi here And why is it squared A geometric answer to the Basel problem By: 3Blue1Brown

The Riemann Hypothesis Explained By: Quanta Magazine

Olympiad level counting Generating functions By: 3Blue1Brown

Eulers formula with introductory group theory By: 3Blue1Brown

Analytic Continuation and the Zeta Function By: zetamath

But what is the Fourier Transform A visual introduction By: 3Blue1Brown