In a certain base \(b\) (different from \(10\)), \(57_b^2 = 2721_b\). What is \(17_b^2\) in this base? Provide your answer in the form of \(k_{b}m_{b}n_{b}\), where \(k\), \(m\), and \(n\) are digits in base \(b\). Calculate the value of \(k + m + n\).

Let's think step by step and output the final answer within \boxed{}.
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