Here is a list of all the current tags in the system, ordered by the number of problems with that tag. This is a work in progress - if you have suggestions of new tags to be added, or that certain tags should be added or removed from a problem, please let me know.

- number theory : 61 solved out of 314
- graph theory : 19 solved out of 58
- unit fractions : 12 solved out of 48
- additive combinatorics : 14 solved out of 47
- geometry : 11 solved out of 38
- ramsey : 9 solved out of 34
- primes : 4 solved out of 30
- arithmetic progressions : 7 solved out of 23
- additive basis : 1 solved out of 22
- irrationality : 1 solved out of 19
- distances : 2 solved out of 18
- sidon sets : 2 solved out of 17
- covering systems : 3 solved out of 16
- cycles : 5 solved out of 14
- divisors : 4 solved out of 11
- chromatic number : 3 solved out of 11
- analysis : 3 solved out of 11
- factorials : 0 solved out of 11
- binomial coefficients : 2 solved out of 10
- combinatorics : 6 solved out of 9
- polynomials : 4 solved out of 8
- complete sequences : 2 solved out of 8
- iterated functions : 0 solved out of 7
- turan number : 3 solved out of 5
- discrepancy : 2 solved out of 4
- powers : 0 solved out of 4
- convex : 3 solved out of 3
- primitive sets : 1 solved out of 3
- group theory : 0 solved out of 2
- squares : 0 solved out of 2
- : 0 solved out of 2
- diophantine approximation : 1 solved out of 2
- set theory : 0 solved out of 1
- sequences : 0 solved out of 1
- hypergraphs : 1 solved out of 1