Japan competition problems
38 problems here, rated 3.9 to 7.6 on our scale (AMC 10/12 to National Olympiad, round 2). 35 of them ask for a proof. Years covered: 2007–2022.
| # | Topic | Diff | Type | Year | |
|---|---|---|---|---|---|
| 1 | Number theory | 3.9 | answer | 2007 | open |
| 2 | Number theory | 4.0 | answer | 2015 | open |
| 3 | Geometry | 4.5 | proof | 2007 | open |
| 4 | Combinatorics | 4.6 | answer | 2007 | open |
| 5 | Geometry | 4.7 | proof | 2007 | open |
| 6 | Geometry | 4.7 | proof | 2007 | open |
| 7 | Geometry | 4.8 | proof | 2022 | open |
| 8 | Number theory | 5.0 | proof | 2022 | open |
| 9 | Algebra | 5.0 | proof | 2015 | open |
| 10 | Number theory | 5.0 | proof | 2015 | open |
| 11 | Geometry | 5.2 | proof | 2022 | open |
| 12 | Geometry | 5.4 | proof | 2015 | open |
| 13 | Geometry | 5.4 | proof | 2022 | open |
| 14 | Combinatorics | 5.6 | proof | 2007 | open |
| 15 | Number theory | 5.6 | proof | 2007 | open |
| 16 | Number theory | 5.7 | proof | 2022 | open |
| 17 | Geometry | 5.9 | proof | 2022 | open |
| 18 | Algebra | 5.9 | proof | 2007 | open |
| 19 | Number theory | 6.0 | proof | 2007 | open |
| 20 | Algebra | 6.0 | proof | 2022 | open |
| 21 | Number theory | 6.1 | proof | 2007 | open |
| 22 | Combinatorics | 6.1 | proof | 2007 | open |
| 23 | Algebra | 6.1 | proof | 2022 | open |
| 24 | Number theory | 6.1 | proof | 2015 | open |
| 25 | Geometry | 6.2 | proof | 2015 | open |
| 26 | Geometry | 6.3 | proof | 2015 | open |
| 27 | Number theory | 6.3 | proof | 2015 | open |
| 28 | Number theory | 6.4 | proof | 2022 | open |
| 29 | Geometry | 6.4 | proof | 2007 | open |
| 30 | Algebra | 6.5 | proof | 2007 | open |
| 31 | Number theory | 6.5 | proof | 2015 | open |
| 32 | Algebra | 6.5 | proof | 2015 | open |
| 33 | Number theory | 6.7 | proof | 2015 | open |
| 34 | Geometry | 6.7 | proof | 2015 | open |
| 35 | Geometry | 7.0 | proof | 2007 | open |
| 36 | Combinatorics | 7.3 | proof | 2007 | open |
| 37 | Combinatorics | 7.6 | proof | 2007 | open |
| 38 | Algebra | 7.6 | proof | 2007 | open |
These are sorted by difficulty within the competition, but they aren't a course.
The track is the route through, drawn from all the sources at once.