User contributions
- 15:54, 15 April 2020 (diff | hist) . . (+6) . . AoPS Wiki:Problem of the Day/September 1, 2011
- 15:54, 15 April 2020 (diff | hist) . . (-19) . . AoPS Wiki:Problem of the Day/September 1, 2011
- 15:53, 15 April 2020 (diff | hist) . . (+135) . . AoPS Wiki:Problem of the Day/September 2, 2011 (current)