八面体数
给定一个数 n，任务是找到第 n 个八面体数。 一个八面体数属于一个图形数，它是由紧密堆积的球体构成的八面体中的球体数。前几个八面体数(其中 n = 0，1，2，3……)。)分别是:0、1、6、19 等等。 示例:
输入:4 输出:44 输入:8 输出:344
第 n 个八面体数的公式:
n * (2n2+1) / 3
C++
// C++ program to find nth
// octahedral number
#include <bits/stdc++.h>
using namespace std;
// Function to find
// octahedral number
int octahedral_num(int n)
{
// Formula to calculate nth
// octahedral number
return n * (2 * n * n + 1) / 3;
}
// Drivers code
int main()
{
int n = 5;
// print result
cout << n << "th Octahedral number: ";
cout << octahedral_num(n);
return 0;
}
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to find nth octahedral
// number
import java.io.*;
class GFG {
// Function to find octahedral number
static int octahedral_num(int n)
{
// Formula to calculate nth
// octahedral number
// and return it into main function.
return n * (2 * n * n + 1) / 3;
}
// Driver Code
public static void main(String[] args)
{
int n = 5;
// print result
System.out.print(n + "th Octahedral"
+ " number: ");
System.out.println(octahedral_num(n));
}
}
Python 3
# Python 3 program to find nth
# octahedral number
# Function to find
# octahedral number
def octahedral_num(n) :
# Formula to calculate nth
# octahedral number
return n * (2 * n * n + 1) // 3
# Driver Code
if __name__ == '__main__' :
n = 5
print(n,"th Octahedral number: "
, octahedral_num(n))
# This code is contributed ajit.
C
// C# program to find nth
// Octahedral number
using System;
class GFG
{
// Function to find
// octahedral number
static int octahedral_num(int n)
{
// Formula to calculate
// nth octahedral number
// and return it into
// main function.
return n * (2 * n *
n + 1) / 3;
}
// Driver Code
static public void Main ()
{
int n = 5;
// print result
Console.Write(n + "th Octahedral"
+ " number: ");
Console.WriteLine(octahedral_num(n));
}
}
// This code is Contributed by m_kit
服务器端编程语言（Professional Hypertext Preprocessor 的缩写）
<?php
// PHP program to find nth
// octahedral number
// Function to find
// octahedral number
function octahedral_num( $n)
{
// Formula to calculate nth
// octahedral number
// and return it into main function.
return $n * (2 * $n * $n + 1) / 3;
}
// Drivers Code
$n = 5;
// print result
echo $n, "th Octahedral number: ";
echo octahedral_num($n);
?>
java 描述语言
<script>
// JavaScript program to find nth
// octahedral number
// Function to find
// octahedral number
function octahedral_num( n)
{
// Formula to calculate nth
// octahedral number
// and return it into main function.
return n * (2 * n * n + 1) / 3;
}
// Drivers Code
let n = 5;
// print result
document.write( n+ "th Octahedral number: ");
document.write(octahedral_num(n));
// This code is contributed by Bobby
</script>
输出:
5th Octahedral number: 85
参考:https://en.wikipedia.org/wiki/Octahedral_numberT2】
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