Only those with the count of 3 or greater are included. Not counting the deceased. Considering CUNY as a single institution. Source of data.
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- Rutgers The State University of New Jersey New Brunswick : 44
- University of California, Los Angeles : 38
- Massachusetts Institute of Technology : 34
- University of California, Berkeley : 34
- University of Michigan : 32
- Cornell University : 26
- Princeton University : 26
- University of Illinois, Urbana-Champaign : 24
- University of Wisconsin, Madison : 24
- Brown University : 23
- Stanford University : 22
- University of Texas at Austin : 22
- New York University, Courant Institute : 21
- The City University of New York : 21
- University of California, San Diego : 21
- University of Illinois at Chicago : 21
- University of Chicago : 20
- University of Washington : 20
- Stony Brook University : 19
- Texas A&M University : 19
- University of California, Santa Barbara : 19
- University of Minnesota-Twin Cities : 18
- University of Pennsylvania : 17
- Duke University : 16
- Indiana University, Bloomington : 16
- Purdue University : 16
- University of Maryland : 16
- Georgia Institute of Technology : 15
- Northwestern University : 15
- Ohio State University, Columbus : 15
- Pennsylvania State University : 15
- University of California, Irvine : 13
- University of Utah : 13
- Johns Hopkins University, Baltimore : 12
- University of British Columbia : 12
- Boston University : 11
- Harvard University : 11
- University of Notre Dame : 11
- University of Toronto : 11
- Eidgenössische Technische Hochschule Zürich (ETH Zürich) : 10
- University of North Carolina at Chapel Hill : 10
- University of Virginia : 10
- Vanderbilt University : 10
- Brandeis University : 9
- University of California, Davis : 9
- University of Georgia : 9
- Columbia University : 8
- Institute for Advanced Study : 8
- Rice University : 8
- Tel Aviv University : 8
- University of Oregon : 8
- California Institute of Technology : 7
- Ecole Polytechnique Fédérale de Lausanne (EPFL) : 7
- Michigan State University : 7
- Microsoft Research : 7
- North Carolina State University : 7
- University of Nebraska-Lincoln : 7
- University of Oxford : 7
- University of Southern California : 7
- Williams College : 7
- Carnegie Mellon University : 6
- The Hebrew University of Jerusalem : 6
- Université Pierre et Marie Curie (Paris VI) : 6
- University of Arizona : 6
- University of Rochester : 6
- Harvey Mudd College : 5
- Northeastern University : 5
- Temple University : 5
- Université Paris-Diderot : 5
- University of California, Riverside : 5
- University of Colorado, Boulder : 5
- Virginia Polytechnic Institute and State University : 5
- Boston College : 4
- Florida State University : 4
- Louisiana State University, Baton Rouge : 4
- NYU Polytechnic School of Engineering : 4
- Norwegian University of Science and Technology : 4
- Rutgers The State University of New Jersey Newark : 4
- University of Cambridge : 4
- University of Connecticut, Storrs : 4
- University of Missouri-Columbia : 4
- University of Tennessee, Knoxville : 4
- University of Warwick : 4
- Washington University : 4
- Weizmann Institute of Science : 4
- Yale University : 4
- Alfréd Rényi Institute of Mathematics, Hungarian Academy of Sciences : 3
- Australian National University : 3
- Barnard College, Columbia University : 3
- Emory University : 3
- Imperial College : 3
- Københavns Universitet : 3
- KTH Royal Institute of Technology : 3
- Mathematical Institute, Oxford University : 3
- McGill University : 3
- Pomona College : 3
- Shanghai Jiao Tong University : 3
- Tsinghua University : 3
- Tufts University : 3
- Università degli Studi di Milano : 3
- Université Paris-Sud (Paris XI) : 3
- Université de Montréal : 3
- University of Iowa : 3
- University of Melbourne : 3
- University of Memphis : 3
You should divide by the number of full professors in the math department at each institution.