results from the theory of computation. It also includes reprints of early papers on the subject, including the paper by Lothar Collatz. References External links An ongoing volunteer computing project by David Bařina verifies Convergence of the Collatz conjecture for large values. (furthest progress so far) (BOINC) volunteer computing project that verifies the Collatz conjecture for larger values. An ongoing volunteer computing project by Eric Roosendaal verifies the Collatz conjecture for larger and larger values. Another ongoing volunteer computing project by Tomás Oliveira e Silva continues to verify the Collatz conjecture (with fewer statistics than Eric Roosendaal's page but with further progress made). . Are computers ready to solve this notoriously unwieldy math problem? Conjectures Arithmetic dynamics Integer sequences Unsolved problems in number theory