Archives of Number Theory List
- Archives of postings to the Number Theory mailing list (NMBRTHRY).
- http://listserv.nodak.edu/archives/nmbrthry.html

Primenumbers
- Discussion list for those who enjoy prime numbers, primality testing, and closely related subjects.
- http://groups.yahoo.com/group/primenumbers/

PrimeForm
- Discussion group for the primality-testing program, PrimeForm. Includes links to the PrimeForm program's home page, contact and download information.
- http://groups.yahoo.com/group/primeform/

numbertheory
- Mailing list covering recreational and serious aspects. [Requires free Yahoo membership.]
- http://groups.yahoo.com/group/numbertheory/

goldbach
- Discussion list for the Goldbach Conjecture.
- http://groups.yahoo.com/group/goldbach/

FermatNumbers
- A group for aggregating all the known properties of Fermat Numbers F(m)=2^2^m+1 in one place. Links to distributed search and lists. Archive available to non-members.
- http://groups.yahoo.com/group/FermatNumbers/