程序找到系列5、12、21、32、45的第N个术语……

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：

5, 12, 21, 32, 45…… 
 

例子：

Input: N = 2
Output: 12

Input: N = 5
Output: 45

方法：
该系列的第N个广义项：

Nth Term : n*n + 4*n 
 

以下是所需的实现：

C++

// CPP program to find
// the N-th term of the series:
// 5, 12, 21, 32, 45......
 
#include 
#include 
using namespace std;
 
// calculate Nth term of series
int nthTerm(int n)
{
    return pow(n, 2) + 4 * n;
}
 
// Driver code
int main()
{
 
    // Get N
    int N = 4;
 
    // Get the Nth term
    cout << nthTerm(N) << endl;
 
    return 0;
}

Java

// Java  program to find
// the N-th term of the series:
// 5, 12, 21, 32, 45......
import java.io.*;
 
class GFG {
     
 
 
// calculate Nth term of series
static int nthTerm(int n)
{
    return (int)Math.pow(n, 2) + 4 * n;
}
 
// Driver code
 
    public static void main (String[] args) {
     
    // Get N
    int N = 4;
 
    // Get the Nth term
    System.out.println( nthTerm(N));
 
    }
}
// This code is contributed
// by  inder_verma

Python3

# Python3 program to find
# the N-th term of the series:
# 5, 12, 21, 32, 45......
 
# calculate Nth term of series
def nthTerm(n):
    return n ** 2 + 4 * n;
 
# Driver code
 
# Get N
N = 4
 
# Get the Nth term
print(nthTerm(N))
 
# This code is contributed by Raj

C#

// C# program to find the
// N-th term of the series:
// 5, 12, 21, 32, 45......
using System;
 
class GFG
{
     
// calculate Nth term of series
static int nthTerm(int n)
{
    return (int)Math.Pow(n, 2) + 4 * n;
}
 
// Driver code
public static void Main ()
{
 
    // Get N
    int N = 4;
     
    // Get the Nth term
    Console.WriteLine(nthTerm(N));
}
}
 
// This code is contributed
// by sh..

Javascript

// JavaScript program to find
// the N-th term of the series:
// 5, 12, 21, 32, 45......
 
 
// calculate Nth term of series
function nthTerm( n)
{
    return Math.pow(n, 2) + 4 * n;
}
 
// Driver code
    // Get N
    let N = 4;
 
    // Get the Nth term
    document.write( nthTerm(N));
 
// This code is contributed by todaysgaurav
 

输出：

32