Archives of Number Theory List
Archives of postings to the Number Theory mailing list (NMBRTHRY).
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.
numbertheory
Mailing list covering recreational and serious aspects. [Requires free Yahoo membership.]
PrimeForm
Discussion group for the primality-testing program, PrimeForm. Includes links to the PrimeForm program's home page, contact and download information.
Primenumbers
Discussion list for those who enjoy prime numbers, primality testing, and closely related subjects.
SeqFan Mailing List
Devoted to the study of integer sequences.
Somos Sequence Mailing List Archive
Maintained by Jim Propp.