Java Program to Print the Series 2 3 12 37 86 167 288 …N

In the previous article we have discussed about Java Program to Print the Series 10 14 28 32 64 … N

In this article we are going to see how to print the series 2 3 12 37 86 167 288 …N by using Java programming language.

Java Program to Print the Series 2 3 12 37 86 167 288 …N

On observing the pattern carefully, we can see 1^st number starts from 2, then the next number follows a logic

2
2 + 1^2 = 3
3 + 3^2 = 12
12 + 5^2 = 37
37 + 7^2 = 86 … and so on

Example:

167

……

Let’s see different ways to print the series 2 3 12 37 86 167 288 …N

By Using For Loop
By Using While Loop
By Using User Defined Method

Method-1: Java Program to Print the Series 2 3 12 37 86 167 288 …N By Using For Loop

Approach:

Create Scanner class object.
Declare an integer variable say ‘n’ which holds the Nth term of the series.
Prompt the user to enter a number as value of n.
Let declare an integer variable say ‘result’ and initialize it to 2
Let declare another integer variable say ‘add’ and initialize it to 1
Use a for loop from i=1 to i<=n-1 where the loop is incremented by 1
Inside the for loop we will find the value of result=result+(add*add) and add=add+2.
Print the result in the series.

Program:

import java.util.*;
public class Main
{
    public static void main(String [] args)
    {
        //creating object of Scanner class 
        Scanner s = new Scanner(System.in);
        //Taking input of number of elements in the series
        System.out.println("Enter the Nth term “N” ");
        int n = s.nextInt();
        int result = 2;
        int add = 1;
        System.out.print(result);
        //for loop to print the series
        for (int i = 1; i <= n-1; i++) 
        {
            result +=(add*add); 
            System.out.print(" "+result);
            add+=2;
        } 
    }
}

Output:

Enter the Nth term “N” 
5
2 3 12 37 86

Method-2: Java Program to Print the Series 2 3 12 37 86 167 288 …N By Using While Loop

Approach:

Create Scanner class object.
Declare an integer variable say ‘n’ which holds the Nth term of the series.
Prompt the user to enter a number as value of n.
Let declare an integer variable say ‘result’ and initialize it to 2
Let declare another integer variable say ‘add’ and initialize it to 1
Declare and initialize an integer variable i=1
Continue a while loop till i<=n-1, where i is incremented by 1.
Inside while loop find the value of result = result+(add*add) and add=add+2
Print the result in the series.

Program:

import java.util.*;
public class Main
{
    public static void main(String [] args)
    {
        //creating object of Scanner class 
        Scanner s = new Scanner(System.in);
        //Taking input of number of elements in the series
        System.out.println("Enter the Nth term “N” ");
        int n = s.nextInt();
        int result=2;
        int add = 1;
        System.out.print(result);
        int i=1;
        while(i<=n-1)
        {
            result +=(add*add); 
            System.out.print("  "+result);
            add+=2;
            i++;
        }      
    }
}

Output:

Enter the Nth term “N” 
7
2 3 12 37 86 167 288

Method-3: Java Program to Print the Series 2 3 12 37 86 167 288 …N By Using User Defined Method

Approach:

Create Scanner class object.
Declare an integer variable say ‘n’ which holds the Nth term of the series.
Prompt the user to enter a number as value of n.
Call a user defined method printSeries() by passing n as parameter.
Inside method declare an integer variable say ‘result’ and initialize it to 2
Let declare another integer variable say ‘add’ and initialize it to 1
Use a for loop from i=1 to i<=n-1 where the loop is incremented by 1
Inside the for loop we will find the value of result=result+(add*add) and add=add+2.
Print the result in the series.

Program:

import java.util.*;
public class Main
{
    public static void main(String[] args)
    {
        // creating object of scanner class 
        Scanner s = new Scanner(System.in);
        //Taking input of number of elements in the series
        System.out.println("Enter the value of Nth term 'N' ");
        int n = s.nextInt();
        // calling printSeries method to print the series
        printSeries(n);
    }
    
    //printSeries metthod to print the series
    public static void printSeries(int n)
    {
        int result = 2, add = 1;
        System.out.print(result);
        //for loop to print the series
        for (int i = 1; i <=n-1; i++) 
        {
            result +=(add*add); 
            System.out.print(" "+result);
            add+=2;
        } 
    }
}

Output:

Enter the value of Nth term 'N' 
9
2 3 12 37 86 167 288 457 682

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