A semiprime is a natural number that is the product of exactly two prime numbers. This can occur in two scenarios: 1. The two prime numbers are distinct, like \(3\) and \(5\), which gives the semiprime \(15\) (since \(3 \times 5 = 15\)).
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A semiprime is a composite number that is a product of exactly two prime numbers, counted with multiplicity. For example, and are semiprimes. Distinct factors give for the Euler totient function, whereas equal factors give . This distinction matters when constructing a uniform coprime state for a semiprime.