同心六边形数

以下数字形成同心六边形序列：
0、1、6、13、24、37、54、73、96、121、150……
数字序列形成具有同心六边形的图案，数字表示在图案的第n个阶段之后所需的点数。

例子：

Input : N = 3 
Output : 13

Input : N = 4 
Output : 24 
 

方法 ：
以上系列可以从同心六角数引用。
n个系列的第术语是3 * N2^分之2

下面是上述方法的实现：

C++

// CPP program to find nth concentric hexagon number
#include 
using namespace std;
 
// Function to find nth concentric hexagon number
int concentric_Hexagon(int n)
{
    return 3 * pow(n, 2) / 2;
}
 
// Driver code
int main()
{
    int n = 3;
 
    // Function call
    cout << concentric_Hexagon(n);
 
    return 0;
}

Java

// Java program to find
// nth concentric hexagon number
class GFG
{
     
    // Function to find
    // nth concentric hexagon number
    static int concentric_Haxagon(int n)
    {
        return 3 * (int)Math.pow(n, 2) / 2;
    }
     
    // Driver Code
    public static void main (String[] args)
    {
        int n = 3;
         
        // Function call
        System.out.println(concentric_Haxagon(n));
    }
}
 
// This code is contributed by
// sanjeev2552

Python3

# Python3 program to find
# nth concentric hexagon number
  
# Function to find
# nth concentric hexagon number
def concentric_Hexagon(n):
 
    return 3 * pow(n, 2) // 2
 
# Driver code
n = 3
 
# Function call
print(concentric_Hexagon(n))
  
# This code is contributed by Mohit Kumar

C#

// C# program to find nth concentric hexagon number
using System;
class GFG
{
 
// Function to find nth concentric hexagon number
static int concentric_Hexagon(int n)
{
    return 3 * (int)Math.Pow(n, 2) / 2;
}
 
// Driver code
public static void Main()
{
    int n = 3;
 
    // Function call
    Console.WriteLine(concentric_Hexagon(n));
}
}
 
// This code is contributed by Nidhi

Javascript

 
// Javascript program to find
// nth concentric hexagon number
 
// Function to find
// nth concentric hexagon number
function concentric_Haxagon(n)
{
    return parseInt(3 * Math.pow(n, 2) / 2);
}
 
// Driver code
var n = 3;
         
// Function call
document.write(concentric_Haxagon(n));
     
// This code is contributed by Ankita saini
 

输出：

13