Day: January 1, 2019

Number 9: Wikipedia

Mathematics[edit]9 is a composite number, its proper divisors being 1 and 3. It is 3 times 3 and hence the third square number. Nine is a Motzkin number.[1] It is the first composite lucky number, along with the first composite odd number and only single-digit composite odd number. Source: 9 […]

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