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Natural numbers, also known as counting numbers, are the base numbers for counting things and objects. A natural number contains no fraction, decimal part, or negative sign. The set of natural numbers is represented by the letter N and contains the numbers from 1 to infinity.
N={1,2,3,4,5, ... }
The dots indicate that the numbers continue to increase by one unit at a time indefinitely. This means that this set contains infinitely many numbers.