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1 (one)

The number 1 has a special place under the odd numbers.

 


Explanation

Natural numbers can be divided into even and odd numbers.

Natural numbers Even numbers Special number: 0
Composite numbers Squares of even numbers
No perfect squares
Only prime number: 2
Odd numbers Special number: 1
Composite numbers Squares of odd numbers
No perfect squares
Prime numbers 4n + 1 prime
4n + 3 prime

 


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