My Erdős Number

My Erdős number is 4.

I just wanted to record this for fun, just in case the site I used to calculate it goes down.

The route is:

1. Myself -> Peter J. Mucha
2. Peter J. Mucha -> Nicolas Fraiman
3. Nicolas Fraiman -> Vasek Chvátal
4. Vasek Chvátal -> Paul Erdős