# Python Program to find Sum of N Natural Numbers

Python program to find sum of n natural numbers; Through this tutorial, i am going to show you how to find the sum of the first n natural number using while loop, for loop, and recursion function.

Formula for Find or Calculate Sum of N Natural Numbers = [n(n+1)]/2 .

## Python Programs to Find/Calculate Sum Of n Natural Numbers

There are three different ways to find sum of n natural numbers in python; as shown below:

• Python Program to Calculate Sum of N Natural Numbers using While Loop
• Python Program to find Sum of N Natural Numbers using For Loop
• Python Program to calculate Sum of N Natural Numbers using Recursion Function

### Python Program to Calculate Sum of N Natural Numbers using While Loop

• Get input number from the user in program
• Iterate while loop and calculate sum of n natural number
• As well as store value in variable
• Print sum of n natural number
```# Python Program to find Sum of N Natural Numbers

number = int(input("Please Enter any Number: "))
total = 0
value = 1
while (value <= number):
total = total + value
value = value + 1
print("The Sum of Natural Numbers from 1 to {0} =  {1}".format(number, total))```

Output

```Please Enter any Number: 5
The Sum of Natural Numbers from 1 to 5 =  15```

### Python Program to find Sum of N Natural Numbers using For Loop

• Get input number from the user in program
• Iterate for loop and calculate sum of n natural number
• As well as store value in variable
• Print sum of n natural number
```# Python Program to find Sum of N Natural Numbers

number = int(input("Please Enter any Number: "))
total = 0
for value in range(1, number + 1):
total = total + value
print("The Sum of Natural Numbers from 1 to {0} =  {1}".format(number, total))```

Output

```Please Enter any Number: 10
The Sum of Natural Numbers from 1 to 10 =  55```

### Python Program to calculate Sum of N Natural Numbers using Recursion Functions

• Get input number from the user in program
• Define a function, which is calcuate sum of n natural number
• As well as store value in variable
• Print sum of n natural number
```# Python Program to find Sum of N Natural Numbers

def sum_of_n_natural_numbers(num):
if(num == 0):
return num
else:
return (num + sum_of_n_natural_numbers(num - 1))

number = int(input("Please Enter any Number: "))
total_value = sum_of_n_natural_numbers(number)
print("Sum of Natural Numbers from 1 to {0} =  {1}".format(number, total_value))```

Output

```Please Enter any Number: 10
The Sum of Natural Numbers from 1 to 10 =  55```