My Three of my co-authors have Erdős numbers of 1. Listed in the order in which they became my co-authors: - Gérald Tenenbaum, seven joint papers with Erdős
- Carl Pomerance, over twenty joint papers with Erdős
- Andrew Granville, two joint papers with Erdős
My first collaboration was with Andrey Feuerverger, which gave me my first finite Erdős number of 4.
Many thanks to Jerry Grossman |