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Concentric Hexagonal Numbers
  • Last Updated : 14 Apr, 2021

The following numbers form the concentric hexagonal sequence : 
0, 1, 6, 13, 24, 37, 54, 73, 96, 121, 150 ……
The number sequence forms a pattern with concentric hexagons, and the numbers denote the number of points required after the n-th stage of the pattern.
 

Examples: 

Input : N = 3 
Output : 13

Input : N = 4 
Output : 24 
 



Approach : 
The above series can be referred from Concentric Hexagonal Numbers.
Nth term of the series is 3*n2/2 

Below is the implementation of the above approach :  

C++




// CPP program to find nth concentric hexagon number
#include <bits/stdc++.h>
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




<script>
 
// 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
 
</script>
Output: 
13

 

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