It's... π day! π day.

Gotta get down on pi day. So for the second year in a row I'm going to try and calculate the digits of pi without using

any kind of calculation device.

In what is now I guess technically

an annual tradition. (Don't judge!)

This time I'm going to use

an infinite series. (Yay!)

I'm going to add and subtract

a lot of fractions to try and get more and more digits of π

There's the classic infinite series that Leibnids(?) gave us-