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/**
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 * @param {number} n
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 * @param {number} k
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 * @return {number}
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 */
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var kthFactor = function (n, k) {
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  const res = [1];
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  for (let i = 2; i < n; i++) {
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    if (n % i === 0) {
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      res.push(i);
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    }
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  }
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  res.push(n);
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  return res[k - 1] || -1;
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};