Learn Natural Number

 Natural Number

An online natural number definition

The natural numbers are those used for counting and ordering.

The positive integers, 1, 2, 3,4 are called the natural numbers or counting numbers.


The sum of the first n natural numbers.

Formula to calculate the first n natural numbers:

$ S_n=1+2+...+n=? $

Math Number Symbols

R - Real Numbers

Z - Integers

N - Natural Numbers

Q - Rational Numbers

P - Irrational Numbers

Sum of the first n natural numbers

 Related Number Types