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• Last Updated : 06 Sep, 2021

Given a number n, the task is to find the nth hexadecagonal number.
A Hexadecagonal number is class of figurate number and a perfect squares. It has sixteen sided polygon called hexadecagon or hexakaidecagon. The n-th hexadecagonal number count’s the sixteen number of dots and all others dots are surrounding to its successive layer.
Examples :

Input : 2
Output :16
Input :7
Output :301  ## C++

 // C++ program to find Nth// hexadecagon number#include using namespace std;  // Function to calculate hexadecagonal numberint hexadecagonalNum(long int n){    return ((14 * n * n) - 12 * n) / 2;}  // Drivers Codeint main(){    long int n = 5;    cout << n << "th Hexadecagonal number : ";    cout << hexadecagonalNum(n);    cout << endl;    n = 9;    cout << n << "th Hexadecagonal number : ";    cout << hexadecagonalNum(n);      return 0;}

## Java

 // Java program to find Nth hexadecagon// numberimport java.io.*;  class GFG {      // Function to calculate hexadecagonal    // number    static long hexadecagonalNum(long n)    {        return ((14 * n * n) - 12 * n) / 2;    }          // Drivers Code    public static void main (String[] args)    {        long n = 5;        System.out.println( n + "th "          + "Hexadecagonal number : "              + hexadecagonalNum(n));                        n = 9;        System.out.println( n + "th "          + "Hexadecagonal number : "              + hexadecagonalNum(n));    }}  // This code contributed by anuj_67.

## Python3

 # Python program to find Nth# hexadecagon number  # Function to calculate# hexadecagonal numberdef hexadecagonalNum(n):      # Formula to calculate nth    # Centered hexadecagonal number    return ((14 * n * n) - 12 * n) // 2  # Driver Coden = 5print("%sth Hexadecagonal number : " %n,                    hexadecagonalNum(n))n = 9print("%sth Hexadecagonal number : " %n,                    hexadecagonalNum(n))                      # This code is contributed by ajit

## C#

 // C# program to find Nth hexadecagon// numberusing System;class GFG {      // Function to calculate hexadecagonal    // number    static long hexadecagonalNum(long n)    {        return ((14 * n * n) - 12 * n) / 2;    }          // Drivers Code    public static void Main ()    {        long n = 5;        Console.WriteLine( n + "th "        + "Hexadecagonal number : "            + hexadecagonalNum(n));                      n = 9;        Console.WriteLine( n + "th "        + "Hexadecagonal number : "            + hexadecagonalNum(n));    }}  // This code contributed by anuj_67.

## PHP

 

## Javascript

 

Output :

5th Hexadecagonal number : 145
9th Hexadecagonal number : 513

Time Complexity: O(1)
Auxiliary Space: O(1)
Reference: https://en.wikipedia.org/wiki/Polygonal_number

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