Java Program to Print the Series 8 14 24 40 … N

In the previous article we have discussed about Java Program to Print the Series 7 26 63 124 215 … N

In this article we are going to see how to print the series 8 14 24 40 … N by using Java programming language.

Java Program to Print the Series 8 14 24 40 … N

On observing the pattern carefully, we can see 1^st number starts from 8

Then the next number follows a logic

8
8 x 1.5 + 2 = 14
14 x 1.5 + 3 = 24
24 x 1.5 + 4 = 40
40 x 1.5 + 5 = 65 … and so on

Example:

……

*1.5+2 *1.5+3 *1.5+4 *1.5+5 *1.5+6

Let’s see different ways to print the series 8 14 24 40 … N

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

Method-1: Java Program to Print the Series 8 14 24 40 … 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 double variable say ‘result’ and initialize it to 8
Let declare another integer variable say ‘add’ and initialize it to 2
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*1.5)+add and add=add+1.
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 numbers of terms in series ");
        int n = s.nextInt();
        double result = 8;
        int add = 2;
        System.out.print((int)result);
        //for loop to print the series
        for (int i = 1; i <= n-1; i++) 
        {
            result =(result*1.5)+add; 
            System.out.print(" "+(int)result);
            add+=1;
        } 
    }
}

Output: 

Enter numbers of terms in series
5
8 14 24 40 65

Method-2: Java Program to Print the Series 8 14 24 40 … 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 double variable say ‘result’ and initialize it to 8
Let declare another integer variable say ‘add’ and initialize it to 2
Declare and initialize an integer variable i=1
Continue a while loop till i<=n-1, where i is incremented by 1.
Inside the while loop we will find the value of result=(result*1.5)+add and add=add+1.
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 numbers of terms in series ");
        int n = s.nextInt();
        double result=8;
        int add = 2;
        System.out.print((int)result);
        int i=1;
        while(i<=n-1)
        {
            result =(result*1.5)+add; 
            System.out.print(" "+(int)result);
            add+=1;
            i++;
        }      
    }
}

Output:

Enter numbers of terms in series
7
8 14 24 40 65 103 162

Method-3: Java Program to Print the Series 8 14 24 40 … 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 double variable say ‘result’ and initialize it to 8
Declare another integer variable say ‘add’ and initialize it to 2
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*1.5)+add and add=add+1.
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 numbers of terms in series ");
        int n = s.nextInt();
        // calling printSeries method to print the series
        printSeries(n);
    }
    
    //printSeries() method to print the series
    public static void printSeries(int n)
    {
        double result = 8, add = 2;
        System.out.print((int)result);
        //for loop to print the series
        for (int i = 1; i <=n-1; i++) 
        {
            result =(result*1.5)+add; 
            System.out.print(" "+(int)result);
            add+=1;
        } 
    }
}

Output:

Enter numbers of terms in series
9
8 14 24 40 65 103 162 251 386

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