Sum of First N Natural numbers
Detailed guide and Python implementation for the 'Sum of First N Natural numbers' problem.
Problem Statement
Write a function sum_natural(n) that takes a positive integer n and returns the sum of the first n natural numbers, i.e., 1 + 2 + 3 + ... + n.
- •1 <= n <= 10^6
Examples
n = 5
15
1 + 2 + 3 + 4 + 5 = 15.
n = 10
55
1 + 2 + 3 + ... + 10 = 55.
n = 1
1
The sum of the first 1 natural number is just 1.
Need a Hint?
Edge Cases to Watch
- Empty input structures
- Single element inputs
- Large numerical bounds
Ready to Solve?
Open the problem in PyRun's browser-based Python editor. Your code runs fully offline — no server required.
Recommended Python Resources
Expand your knowledge with related interactive tutorials, cheat sheets, and code comparisons.
Python Loops
Learn how to use Python loops to iterate over data. Master for loops, while loops, break, continue, and loop best practices with interactive examples.
How to Reverse a String in Python
Learn how to reverse a string in Python using slicing, the reversed() function, and loop concatenation with visual code examples.
Python String Methods
A complete reference guide for Python string manipulation. Master formatting, searching, splitting, replacing, and checking string properties.
Python vs JavaScript: Which Programming Language is Best?
A comprehensive comparison between Python and JavaScript. Explore syntax differences, performance, use cases (backend vs frontend), and coding examples.