Y by PRMOisTheHardestExam, Stuart111, crazyeyemoody907, deplasmanyollari, cubres, Funcshun840
Which positive integers
make the equation
true?

![\[\sum_{i=1}^n \sum_{j=1}^n \left\lfloor \frac{ij}{n+1} \right\rfloor=\frac{n^2(n-1)}{4}\]](http://latex.artofproblemsolving.com/e/7/f/e7fb8c20a43535b5aaed5ab254f1ef043263c62b.png)
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