| Extremal Subsets of {1, ..., n} Avoiding Solutions to Linear Equations in Three Variables Recent countries visiting this post |  |
 | 3 | United States |
 | 1 | Russian Federation |
| Extremal Subsets of {1, ..., n} Avoiding Solutions to Linear Equations in Three Variables Recent countries visiting this post | |
| 3 | United States |
| 1 | Russian Federation |