Pi Day -- Calculate pi in 3 ways (that I know of)

[simon-tiger]

Here's one way to do it:

But here are my favorite ones:

or:

where:

and p(n) gives the nth prime. A prime is a number that cannot be divided by anything other than 1 and itself without a remainder.

[shiffman]

Thank you for this! The images for "way 1" and "way 2" aren't showing up, can you check them?

[simon-tiger]

Now they're showing up!