(Germany) University of Siegen (Popularity: )

Algebra and Number Theory group. Members, research interests.

(USA) Texas A and M University (Popularity: )

Combinatorics/Number Theory Directory.

(UK) University of Cambridge (Popularity: )

Number Theory Seminar. Meetings.

(Austria) University of Vienna (Popularity: )

Johannes Schoißengeier's number theory research group. Members, research interests, links to other Austrian number theorists.

(Europe) Arithmetic Algebraic Geometry (Popularity: )

A European network of 12 working groups from 6 countries.

(Canada) CICMA, Concordia University, Montreal (Popularity: )

Number Theory Page. Members, seminars, preprints.

(South Africa) The John Knopfmacher Centre for Applicable Analysis and Number Theory, University of the Witwatersrand (Popularity: )

Members, research interests, preprints, meetings.

(USA) University of California, Los Angeles (Popularity: )

Number Theory Group. Members, events, resources.

(Canada) University of Toronto (Popularity: )

Number Theory/Representation Theory Seminar. Schedule of meetings.

(Russia) Steklov Institute, St. Petersburg (Popularity: )

Laboratory of Number Theory. Research interests.

(USA) Boston University (Popularity: )

Algebra and Number Theory Research Group. Members, research interests, seminars, courses.

(USA) University of California Irvine (Popularity: )

Number theory seminar. Meetings, study groups, links.

(USA)University of Michigan (Popularity: )

Graduate Program in Number Theory. Staff, research interests, courses, seminars.

(Austria) University of Natural Resources, Vienna (Popularity: )

Number theory group led by Werner Georg Nowak. Members, research interests, publications, links.

(Brazil) Universidade de Brasília (Popularity: )

Automorphic Forms and Number Theory group. Members, research interests.

(Sweden) Uppsala University (Popularity: )

Mathematics III research group: quantum chaos and number theory.

(USA) University of California, Santa Barbara (Popularity: )

Arithmetic and Geometry Seminar. Meetings.

(USA) University of Rochester (Popularity: )

Algebra and Number Theory Group. Members, research interests, seminar schedule.

(Germany) Clausthal University of Technology (Popularity: )

Institut für Mathematik - Number Theory Research Group. People, research topics.

(UK) University of York (Popularity: )

Number Theory Research Group.