1991 AIME Problems/Problem 15

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Problem

For positive integer $n_{}^{}$, define $S_n^{}$ to be the minimum value of the sum

$\sum_{k=1}^n \sqrt{(2k-1)^2+a_k^2},$

where $a_1,a_2,\ldots,a_n^{}$ are positive real numbers whose sum is 17. There is a unique positive integer $n^{}_{}$ for which $S_n^{}$ is also an integer. Find this $n^{}_{}$.

Solution

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See also

1991 AIME (ProblemsAnswer KeyResources)
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Problem 14
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