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#2625. 垃圾还是珍宝

Statistiques

给定一个正整数 $k$。求满足 $n^2 - k \cdot p^m = 1$ 的正整数元组 $(n, p, m)$ 的数量,其中 $p$ 是一个质数。如果存在无穷多个这样的元组,请输出 $-1$。

输入格式

每个测试包含多个测试用例。第一行包含测试用例的数量 $t$ ($1 \le t \le 100$)。 接下来是各测试用例的描述。 每个测试用例仅包含一行,为一个整数 $k$ ($1 \le k \le 10^9$)。

输出格式

对于每个测试用例,输出满足 $n^2 - k \cdot p^m = 1$ 且 $p$ 为质数的正整数元组 $(n, p, m)$ 的数量;如果存在无穷多个,则输出 $-1$。

样例

样例输入 1

2
5
22

样例输出 1

3
0

说明

在第一个测试用例中,对于 $k = 5$,唯一可能的元组是 $(4, 3, 1)$,$(6, 7, 1)$ 和 $(9, 2, 4)$。 在第二个测试用例中,对于 $k = 22$,不存在可能的元组。

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