This group is for discussion of the unsolved problems in number theory, logic, and cryptography which are featured on the web site http://UnsolvedProblems.org.

Problems include the chromatic number of the plane, the Goldbach conjecture, the twin primes conjecture, the Dorabella cipher, the existence of an odd perfect number, the existence of a magic square of squares, the Collatz conjecture, the Riemann hypothesis, and the Voynich manuscript, amongst others.

The web site at http://UnsolvedProblems.org describes the problems and offers potential solvers the opportunity to have their solutions published, while this group facilitates questions and discussion.