All Problems Random Solved Random Open
Other Erdős problem lists
  • Most significantly Erdős' Problems on Graphs is a project very similar to this, although only for those problems related to graph theory. It contains 170 graph theory problems posed by Erdős, with references and commentary.
  • Wikipedia has a list of some.
  • Here is a list of the problem collections published by Erdős.
Other Erdős-related links.