Python Program for Sum of squares of first n natural numbers

Python program to find sum of squares of first n natural numbers; In this tutorial, you will learn how to find sum of squares of first n natural numbers in python using for loop and mathematical formula.

Python Program for Sum of squares of first n natural numbers

There are the following python programs to to find sum of squares of first n (50, 100, 1000) natural numbers; as shown below:

• Python program to find sum of squares of first n natural numbers using for loop
• Python program to find sum of squares of first n natural numbers using mathmatic formula

Python program to find sum of squares of first n natural numbers using for loop

Use the following steps and write a program to find the sum of squares of the first n natural numbers:

• Take input number from the user
• Calculate the sum of square of given N number using for loop
• Display sum of square of n given number

# Python program for sum of the
# square of first N natural numbers

# Getting input from users
N = int(input("Enter value of N: "))

# calculating sum of square
sumVal = 0
for i in range(1, N+1):
    sumVal += (i*i)

print("Sum of squares = ", sumVal)

Output

Enter value of N: 10
Sum of squares =  385

Python program to find sum of squares of first n natural numbers using mathmatic formula

Use the following steps and write a program to find the sum of squares of the first n natural numbers:

• Take input number from the user
• Calculate the sum of square of the n given number using mathmatic formula
• Display sum of square of n given number

# Python program for sum of the
# square of first N natural numbers

# Getting input from user
N = int(input("Enter value of N: "))

# calculating sum of square
sumVal =  (int)( (N * (N+1) * ((2*N) + 1))/6 )
print("Sum of squares =",sumVal)

Output

Enter value of N: 12
Sum of squares =  650

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