# Heptacontagon Number

Given a number N, the task is to find Nth Heptacontagon number.

A Heptacontagon number is class of figurate number. It has 70 – sided polygon called heptacontagon. The N-th heptacontagon number count’s the 70 number of dots and all others dots are surrounding with a common sharing corner and make a pattern. The first few heptacontagonol numbers are 1, 70, 207, 412 …

Examples:

Input: N = 2
Output: 70
Explanation:
The second heptacontagonol number is 70.

Input: N = 3
Output: 207

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach: The N-th heptacontagon number is given by the formula:

• Nth term of s sided polygon = • Therefore Nth term of 70 sided polygon is Below is the implementation of the above approach:

## C++

 // C++ program for above approach  #include  using namespace std;     // Finding the nth heptacontagon number  int heptacontagonNum(int n)  {      return (68 * n * n - 66 * n) / 2;  }     // Driver code  int main()  {      int N = 3;             cout << "3rd heptacontagon Number is = "           << heptacontagonNum(N);         return 0;  }     // This code is contributed by shivanisinghss2110

## C

 // C program for above approach  #include  #include     // Finding the nth heptacontagon Number  int heptacontagonNum(int n)  {      return (68 * n * n - 66 * n) / 2;  }     // Driver code  int main()  {      int N = 3;      printf("3rd heptacontagon Number is = %d",             heptacontagonNum(N));         return 0;  }

## Java

 // Java program for the above approach  class GFG{     // Finding the nth heptacontagon number   static int heptacontagonNum(int n)   {       return (68 * n * n - 66 * n) / 2;   }      // Driver Code  public static void main(String[] args)  {      int N = 3;       System.out.println("3rd heptacontagon Number is = " +                                      heptacontagonNum(N));  }  }     // This code is contributed by rutvik_56

## Python3

 # Python3 program for above approach     # Finding the nth heptacontagon Number  def heptacontagonNum(n):         return (68 * n * n - 66 * n) // 2;     # Driver code  N = 3;  print("3rd heptacontagon Number is =",                   heptacontagonNum(N));     # This code is contributed by Akanksha_Rai

## C#

 // C# program for the above approach  using System;  class GFG{     // Finding the nth heptacontagon number   static int heptacontagonNum(int n)   {       return (68 * n * n - 66 * n) / 2;   }      // Driver Code  public static void Main()  {      int N = 3;       Console.Write("3rd heptacontagon Number is = " +                                 heptacontagonNum(N));  }  }     // This code is contributed by Akanksha_Rai

Output:

3rd heptacontagon Number is = 207


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