To understand this example, you should have the knowledge of the following Python programming topics:

• Python if...else Statement
• Python Functions
• Python Recursion

# Python program to find the sum of natural using recursive function

def recur_sum(n):
   if n <= 1:
       return n
   else:
       return n + recur_sum(n-1)

# change this value for a different result
num = 16

if num < 0:
   print("Enter a positive number")
else:
   print("The sum is",recur_sum(num))

The sum is 136

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