Given a number n, the task is to find the nth Enneadecagonal number.
An Enneadecagonal number is a nineteen-sided polygon in mathematics. It belongs to a class of figurative numbers. The number contains the number of dots and the dots are arranged in a pattern or series. An Enneadecagonal number is also known as nonadecagon. The dots have common points and all other dots are arranged in the successive layer.
Examples :
Input : 4
Output :106
Input :10
Output :775
Formula to find nth Enneadecagonal number :
C++
// C++ program to find// nth Enneadecagonal number#include <bits/stdc++.h>using namespace std;// Function to calculate // Enneadecagonal numberint nthEnneadecagonal(long int n){ // Formula for finding // nth Enneadecagonal number return (17 * n * n - 15 * n) / 2;}// Drivers codeint main(){ long int n = 6; cout << n << "th Enneadecagonal number :" << nthEnneadecagonal(n); return 0;} |
C
// C program to find// nth Enneadecagonal number#include <stdio.h>// Function to calculate // Enneadecagonal numberint nthEnneadecagonal(long int n){ // Formula for finding // nth Enneadecagonal number return (17 * n * n - 15 * n) / 2;}// Drivers codeint main(){ long int n = 6; printf("%ldth Enneadecagonal number : %d",n,nthEnneadecagonal(n)); return 0;}// This code is contributed by kothavvsaakash. |
Java
// Java program to find// nth Enneadecagonal numberimport java.io.*;class GFG { // Function to calculate // Enneadecagonal number static int nthEnneadecagonal(int n) { // Formula for finding // nth Enneadecagonal number return (17 * n * n - 15 * n) / 2; } // Driver Code public static void main (String[] args) { int n = 6; System.out.print(n + "th Enneadecagonal number :"); System.out.println( nthEnneadecagonal(n)); }}// This code is contributed by m_kit. |
Python3
# Program to find nth# Enneadecagonal numberdef nthEnneadecagonal(n) : # Formula to calculate nth # Enneadecagonal number return (17 * n * n - 15 * n) // 2# Driver Codeif __name__ == '__main__' : n = 6 print(n,"th Enneadecagonal number :" , nthEnneadecagonal(n))# This code is contributed by Ajit |
C#
// C# program to find// nth Enneadecagonal numberusing System;class GFG{ // Function to calculate // Enneadecagonal number static int nthEnneadecagonal(int n) { // Formula for finding // nth Enneadecagonal number return (17 * n * n - 15 * n) / 2; } // Driver Code static public void Main () { int n = 6; Console.Write(n + "th Enneadecagonal number :"); Console.WriteLine( nthEnneadecagonal(n)); }}// This code is contributed by aj_36 |
PHP
<?php// PHP program to find// nth Enneadecagonal number// Function to calculate // Enneadecagonal numberfunction nthEnneadecagonal($n){ // Formula for finding // nth Enneadecagonal number return (17 * $n * $n - 15 * $n) / 2;}// Driver Code$n = 6;echo $n , "th Enneadecagonal number :" , nthEnneadecagonal($n);// This code is contributed by ajit?> |
Javascript
<script> // Javascript program to find nth Enneadecagonal number // Function to calculate // Enneadecagonal number function nthEnneadecagonal(n) { // Formula for finding // nth Enneadecagonal number return (17 * n * n - 15 * n) / 2; } let n = 6; document.write(n + "th Enneadecagonal number :"); document.write( nthEnneadecagonal(n)); </script> |
Output:
6th Enneadecagonal number :261
Time Complexity: O(1)
Auxiliary Space: O(1)
