Kamilla constructs the following triangle of positive odd numbers:

\[ \begin{array} { l l l l l } 1 \\ 3 & 5 \\ 7 & 9 & 11 \\ 13 & 15 & 17 & 19 \\ \end{array} \]

On which row will the number 2013 appear?

This problem is shared by Kamilla L.

**Details and assumptions**

The pattern of the triangle is that there are \(n\) numbers in the \(n\)th row and that each entry is 2 more than the previous value.

The numbers \(13, 15, 17\) and 19 appear in the 4th row.

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