# Python Program to Print Series -1 4 -7 10 -13 16 -19…n

In the previous article, we have discussed Python Program To Print Cube Number Series 1 8 27 64…N
Given a number N and the task is to print the series (-1 4 -7 10 -13 16 -19…N) till the given number N in Python.

Examples:

Example1:

Input:

Given Number (Limit) = 12

Output:

The above series till the given number{ 12 } is :
-1 4 -7 10 -13 16 -19 22 -25 28 -31 34

Example2:

Input:

Given Number (Limit) = 15

Output:

The above series till the given number{ 15 } is :
-1 4 -7 10 -13 16 -19 22 -25 28 -31 34 -37 40 -43

## Program to Print Series -1 4 -7 10 -13 16 -19…n in Python

Below are the ways to print the series (-1 4 -7 10 -13 16 -19…N) till the given number N in Python:

### Method #1: Using While Loop (Static Input)

Approach:

• Give the number N (Limit) as static input and store it in a variable.
• Take a variable to say itr and initialize its value to 1.
• Take another variable say p and initialize its value to 1.
• Loop until the above-declared variable itr value is less than or equal to the given number using the while loop.
• Inside the loop, check if the above variable itr value is even or not using the if conditional statement.
• If it is true, then print the value of p separated by spaces.
• Else, print the value of -1 multiplied with p separated by spaces.
• Increment the above p value by 3.
• Increment the above itr value by 1.
• The Exit of the Program.

Below is the implementation:

# Give the number N(limit) as static input and store it in a variable.
gvn_numb = 12
# Take a variable to say itr and initialize its value to 1.
itr = 1
# Take another variable say p and initialize its value to 1.
p = 1
print("The above series till the given number{", gvn_numb, "} is :")
# Loop until the above-declared variable itr value is less than or equal to the
# given number using the while loop.
while(itr <= gvn_numb):
#Inside the loop, check if the above variable itr value is even or not using the
#if conditional statement.

if(itr % 2 == 0):
#If it is true, then print the value of p separated by spaces.
print(p, end=" ")
else:
#Else, print the value of -1 multiplied with p separated by spaces.
print(-1*p, end=" ")
#Increment the above p value by 3.
p += 3
#Increment the above itr value by 1.
itr += 1


Output:

The above series till the given number{ 12 } is :
-1 4 -7 10 -13 16 -19 22 -25 28 -31 34

### Method #2: Using While loop (User Input)

Approach:

• Give the number N (Limit) as user input using the int(input()) function and store it in a variable.
• Take a variable to say itr and initialize its value to 1.
• Take another variable say p and initialize its value to 1.
• Loop until the above-declared variable itr value is less than or equal to the given number using the while loop.
• Inside the loop, check if the above variable itr value is even or not using the if conditional statement.
• If it is true, then print the value of p separated by spaces.
• Else, print the value of -1 multiplied with p separated by spaces.
• Increment the above p value by 3.
• Increment the above itr value by 1.
• The Exit of the Program.

Below is the implementation:

# Give the number N (Limit) as user input using the int(input()) function and
# store it in a variable.
gvn_numb = int(input("Enter some Random Number = "))
# Take a variable to say itr and initialize its value to 1.
itr = 1
# Take another variable say p and initialize its value to 1.
p = 1
print("The above series till the given number{", gvn_numb, "} is :")
# Loop until the above-declared variable itr value is less than or equal to the
# given number using the while loop.
while(itr <= gvn_numb):
#Inside the loop, check if the above variable itr value is even or not using the
#if conditional statement.

if(itr % 2 == 0):
#If it is true, then print the value of p separated by spaces.
print(p, end=" ")
else:
#Else, print the value of -1 multiplied with p separated by spaces.
print(-1*p, end=" ")
#Increment the above p value by 3.
p += 3
#Increment the above itr value by 1.
itr += 1



Output:

Enter some Random Number = 15
The above series till the given number{ 15 } is :
-1 4 -7 10 -13 16 -19 22 -25 28 -31 34 -37 40 -43

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