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"1 is neither a prime nor a composite number" can it form a coprime number with other natural numbers? Please comment on it. Why? According to the definition of Coprime number, only two natural numbers of "1" are coprime numbers. So the common divisor of "1, 3" is only "1", so 1 and 3 should be coprime numbers.
Yes, there is a definition in the textbook: "1 and any natural number are coprime numbers." you are right
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