A14217 | $Short Task$

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题目描述

Let us denote by $d(n)$ the sum of all divisors of the number $n$ , i.e. $d(n) = \sum\limits_{k | n} k$ . For example, $d(1) = 1$ , $d(4) = 1+2+4=7$ , $d(6) = 1+2+3+6=12$ . For a given number $c$ , find the minimum $n$ such that $d(n) = c$ .

The first line contains one integer $t$ ( $1 \le t \le 10^4$ ). Then $t$ test cases follow. Each test case is characterized by one integer $c$ ( $1 \le c \le 10^7$ ).

For each test case, output: - "-1" if there is no such $n$ that $d(n) = c$ ; - $n$ , otherwise.

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C++ 编辑器

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