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 : 63 solved out of 315
- graph theory : 19 solved out of 59
- unit fractions : 12 solved out of 48
- additive combinatorics : 15 solved out of 47
- geometry : 13 solved out of 45
- ramsey : 9 solved out of 36
- primes : 5 solved out of 30
- analysis : 9 solved out of 27
- arithmetic progressions : 7 solved out of 23
- additive basis : 3 solved out of 22
- irrationality : 1 solved out of 19
- distances : 2 solved out of 19
- sidon sets : 2 solved out of 17
- covering systems : 3 solved out of 16
- cycles : 5 solved out of 14
- combinatorics : 7 solved out of 12
- divisors : 4 solved out of 11
- chromatic number : 3 solved out of 11
- factorials : 0 solved out of 11
- binomial coefficients : 2 solved out of 10
- 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 6
- 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
- set theory : 0 solved out of 2
- squares : 0 solved out of 2
- hypergraphs : 1 solved out of 2
- : 1 solved out of 2
- diophantine approximation : 1 solved out of 2
- sequences : 0 solved out of 1
- probability : 0 solved out of 1