Python program to find the sum of natural numbers using recursion

In this tutorial, we will discuss a concept of the Python program to find the sum of natural numbers using recursion

In this article, we are going to learn how to find sum of natural numbers using recursion in the Python programming language

What are Natural numbers

The positive integer numbers 1,2,3,4….n are known as natural numbers

Program 1

This program allows defining a number to find the sum of natural numbers from 1 to given number using the recursive function in Python programming language.

#Python program to find the sum of natural numbers up to given number using recursive function
def sum_Num(n):
    if n<= 1:
        return n
    else:
        return n+ sum_Num(n-1)

num=16 #you can change this value for different result

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

When the above code is executed, it produces the following results

The sum is : 136

Program 2

This program allows to enter a number to find addition of natural numbers from 1 to given number using recursive function in Python programming language

#Python program to find the sum of natural numbers up to given number using recursive function
def sum_Num(n):
    if n<= 1:
        return n
    else:
        return n+ sum_Num(n-1)

num=int(input("Enter a number: "))

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

When the above code is executed, it produces the following results