Fan Chung and Ron Graham's book *Erdos on Graphs: His Legacy of Unsolved Problems* (A. K. Peters, 1998) collects together all of Erdos's open problems in graph theory that they could find into a single volume, complete with bounties where applicable. Of course Erdos posed many other open problems in combinatorics and number theory that do not appear in this book. I once heard a rumor that some people were working on a project to publish a similar but more comprehensive book or series of books, covering *all* of Erdos's open problems, but I don't know if the rumor is true. Does such a compilation exist? If not, is there *anything* else like this besides Chung and Graham's book?



Does there exist a comprehensive compilation of Erdos's open problems?
Recently, Thomas Bloom created a website dedicated exactly to this:


<https://www.erdosproblems.com/>


It currently lists 214 problems, both open and closed. They are all tagged and some problems carry additional information. The list still evolves and if a problem is missing you might want to contact Thomas directly.


