numbertheory (Popularity: )

Mailing list covering recreational and serious aspects. [Requires free Yahoo membership.]

Archives of Number Theory List (Popularity: )

Archives of postings to the Number Theory mailing list (NMBRTHRY).

Primenumbers (Popularity: )

Discussion list for those who enjoy prime numbers, primality testing, and closely related subjects.

PrimeForm (Popularity: )

Discussion group for the primality-testing program, PrimeForm. Includes links to the PrimeForm program's home page, ...

SeqFan Mailing List (Popularity: )

Devoted to the study of integer sequences.

goldbach (Popularity: )

Discussion list for the Goldbach Conjecture.

FermatNumbers (Popularity: )

A group for aggregating all the known properties of Fermat Numbers F(m)=2^2^m+1 in one place. ...

Somos Sequence Mailing List Archive (Popularity: )

Maintained by Jim Propp.