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- Introductory Algebra Problems (940 members)
- Stubs (677 members)
- Introductory Geometry Problems (569 members)
- Intermediate Algebra Problems (498 members)
- Intermediate Geometry Problems (473 members)
- Piphi (334 members)
- Problems with no solution (308 members)
- Intermediate Number Theory Problems (283 members)
- Intermediate Combinatorics Problems (265 members)
- Definition (243 members)
- Introductory Number Theory Problems (197 members)
- Olympiad Geometry Problems (185 members)
- Geometry (184 members)
- Introductory Combinatorics Problems (161 members)
- Olympiad Algebra Problems (133 members)
- Creative Projects (119 members)
- Olympiad Number Theory Problems (103 members)
- Olympiad Combinatorics Problems (99 members)
- Mathematics competitions (95 members)
- AHSME Problems (89 members)
- Theorems (87 members)
- 3D Geometry Problems (84 members)
- Algebra (82 members)
- Chess Piphi (78 members)
- Problem of the Day (72 members)
- Number theory (67 members)
- Words of the Week (60 members)
- Physics (54 members)
- AMC 12 Problems (51 members)
- Group theory (51 members)
- AMC 10 Problems (50 members)
- Succession templates (40 members)
- Ring theory (40 members)
- Combinatorics (40 members)
- Go (39 members)
- Math Contest Problems (38 members)
- Intermediate Trigonometry Problems (37 members)
- Article of the Day (37 members)
- AHSME (36 members)
- Disambiguation (36 members)
- Abstract algebra (36 members)
- Introduction to Programming (32 members)
- Introductory Probability Problems (32 members)
- Olympiad Inequality Problems (30 members)
- Calculus (30 members)
- Inequalities (29 members)
- Area Problems (29 members)
- Mancala (28 members)
- Shortcuts (28 members)
- Asymptote (28 members)
