Quote:
Originally Posted by axn
<snip YouTube link>
Apologies if someone has already posted this elsewhere.

Nope, but somebody posted on it a day after you did,
here.
Nice leadin to Dirichlet's theorem on primes in arithmetic progressions.
I find it bemusing that everything in the polar graphs lies on a single spiral
but a swarm of spirals seems to appear.
Ex uno plura!