() and any non-zero natural number can form coprime numbers; the product of two prime numbers must be ()
1 and any non-zero natural number can form coprime number;
The product of two prime numbers must be a composite number
In natural numbers within 10, what are two adjacent prime numbers?
2 3
In the natural numbers of 1-9, the two adjacent prime numbers are () and (), and the two adjacent sum numbers are () and ()
23.89