- Paul Erdös has an Erdös number of 0.
- If your Erdös number is not ≤ i and you have one or more co-authors with Erdös number i than your Erdös number is i+1.

Jerry Grossman maintains a web page devoted to the Erdös number project.

Here is a conversation I once had with a colleague Carl Smith.

Carl: I think my Erdös number is 4.

Me: My Erdös number is 2.

Carl: My Erdös number is 3.

So what is your Erdös number? It is probably less than you think.

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