程序以找到系列0、7、18、33、51、75、102、133，…的Nth项。

给定数字N。任务是编写一个程序来查找以下系列的第N个术语：

0, 7, 18, 33, 51, 75, 102, 133, …(N Terms)

例子：

Input: N = 4
Output: 33
For N = 4
4th Term = ( 2 * 4 * 4 + 4 - 3) 
         = 33

Input: N = 10
Output: 206

方法：本系列的广义第N个术语：

$nth\: Term\: of\: the\: series\: = 2*n^2+n-3$

以下是所需的实现：

C++

// C++ program to find the N-th term of the series:
// 0, 7, 18, 33, 51, 75, 102, .....
#include 
#include 
using namespace std;
 
// calculate Nth term of series
int nthTerm(int n)
{
    return 2 * pow(n, 2) + n - 3;
}
 
// Driver code
int main()
{
    int N = 4;
 
    cout << nthTerm(N) << endl;
 
    return 0;
}

Java

// Java program to find the N-th term of the series:
// 0, 7, 18, 33, 51, 75, 102, .....
 
import java.io.*;
 
class GFG {
  
 
// calculate Nth term of series
static int nthTerm(int n)
{
    return 2 * (int)Math.pow(n, 2) + n - 3;
}
 
// Driver code
 
    public static void main (String[] args) {
            int N = 4;
 
    System.out.println( nthTerm(N));
    }
}
// This code is contributed
// by anuj_67..

Python3

# Python3 program to find the
# N-th term of the series:
# 0, 7, 18, 33, 51, 75, 102, .....
 
# calculate Nth term of series
def nthTerm(n):
 
    return 2 * pow(n, 2) + n - 3
 
# Driver code
N = 4
print(nthTerm(N))
 
# This code is contributed by
# Sanjit_Prasad

C#

// C# program to find the
// N-th term of the series:
// 0, 7, 18, 33, 51, 75, 102, .....
using System;
 
class GFG
{
 
// calculate Nth term of series
static int nthTerm(int n)
{
    return 2 * (int)Math.Pow(n, 2) + n - 3;
}
 
// Driver code
public static void Main ()
{
    int N = 4;
 
    Console.Write( nthTerm(N));
}
}
 
// This code is contributed
// by ChitraNayal

Javascript

 
// JavaScript program to find the N-th term of the series:
// 0, 7, 18, 33, 51, 75, 102, .....
 
// calculate Nth term of series
function nthTerm( n)
{
    return 2 * Math.pow(n, 2) + n - 3;
}
 
// Driver code
 
let N = 4;
 
   document.write( nthTerm(N) );
 
// This code contributed by gauravrajput1
 

输出：

33

时间复杂度： O(1)