深红三元组AI (CI翻译)
Chills run down your spine...— Terraria
寒意沿着你的脊背蔓延……——《泰拉瑞亚》AI (CI翻译)
After summoning the next boss — The Brain of Cthulhu, you noticed that it surrounds itself with $n$ eyes, numbered from $1$ to $n$. In one attack, The Brain of Cthulhu chooses a triple of eyes (not necessarily distinct) with numbers $(a, b, c)$. The triple of eyes is called crimson if and only if the following property holds:
召唤下一个 Boss——克苏鲁之脑后,你发现它周围环绕着 $n$ 只眼睛,编号从 $1$ 到 $n$。每次攻击时,克苏鲁之脑会选择一组三元组眼睛(编号可以重复)$(a, b, c)$。当且仅当满足以下性质时,这组三元组眼睛称为深红三元组:AI (CI翻译)
$\gcd,$$^{\text{∗}}$$(\operatorname{lcm}$$^{\text{†}}$$(a, b), \operatorname{lcm}(b, c)) = \gcd(a, c)$
$\gcd,AI (CI翻译)$$^{\text{∗}}$$(\operatorname{lcm}$$^{\text{†}}$$(a, b), \operatorname{lcm}(b, c)) = \gcd(a, c)$
To defeat the boss, you want to know how many ways The Brain of Cthulhu can choose a crimson triple of eyes. The triples of eyes $(a_1, b_1, c_1)$ and $(a_2, b_2, c_2)$ are considered different if $a_1 \neq a_2$, or $b_1 \neq b_2$, or $c_1 \neq c_2$.
为了击败 Boss,你想知道克苏鲁之脑有多少种方式可以选择深红三元组。若三元组眼睛 $(a_1, b_1, c_1)$ 和 $(a_2, b_2, c_2)$ 满足 $a_1 \neq a_2$、$b_1 \neq b_2$ 或 $c_1 \neq c_2$ 中的任意一项,则认为它们不同。AI (CI翻译)
$^{\text{∗}} denotes the least common multiple (LCM) of integers $$\gcd(x, y)$ denotes the [greatest common divisor (GCD)](https://en.wikipedia.org/wiki/Greatest_common_divisor) of integers $x$ and $y$.$^{\text{†}}$$\operatorname{lcm}(x, y)$$x$ and $y$.
$^{\text{∗}} 表示整数 $$\gcd(x, y)$ 表示整数 $x$ 和 $y$ 的[最大公约数(GCD)](https://en.wikipedia.org/wiki/Greatest_common_divisor)。$^{\text{†}}$$\operatorname{lcm}(x, y)$$x$ 和 $y$ 的最小公倍数(LCM)。AI (CI翻译)
Input
输入格式
AI (CI翻译)Each test contains multiple test cases. The first line contains the number of test cases $t$ ($1 \le t \le 1000$). The description of the test cases follows.
每个输入包含多组测试用例。第一行包含测试用例数量 $t$($1 \le t \le 1000$)。接下来是各测试用例的描述。AI (CI翻译)
The only line of each test case contains one integer $n$ ($1 \le n \le 2 \cdot 10^5$) — the number of eyes of The Brain of Cthulhu.
每个测试用例仅一行,包含一个整数 $n$($1 \le n \le 2 \cdot 10^5$),表示克苏鲁之脑的眼睛数量。AI (CI翻译)
It is guaranteed that the sum of $n$ across all test cases does not exceed $2 \cdot 10^5$.
保证所有测试用例的 $n$ 之和不超过 $2 \cdot 10^5$。AI (CI翻译)
Output
输出格式
AI (CI翻译)For each test case, output one integer — the number of ways to choose a crimson triple of eyes.
对于每个测试用例,输出一个整数,表示选择深红三元组的方式数。AI (CI翻译)
Note
说明
AI (CI翻译)In the first test case, there is $1$ possible crimson triple: $(1, 1, 1)$.
第一个测试用例中,有 $1$ 个可能的深红三元组:$(1, 1, 1)$。AI (CI翻译)
In the second test case, there are $5$ possible crimson triples: $(1, 1, 1)$, $(1, 1, 2)$, $(2, 1, 1)$, $(2, 1, 2)$, $(2, 2, 2)$.
第二个测试用例中,有 $5$ 个可能的深红三元组:$(1, 1, 1)$、$(1, 1, 2)$、$(2, 1, 1)$、$(2, 1, 2)$、$(2, 2, 2)$。AI (CI翻译)
样例
3
1
2
20
1
5
612
题面与样例版权归 Codeforces 及出题人所有;中文翻译由 AI 生成(gpt-6.1-sol),如有出入请以原文为准。