biprimality
Biprimality refers to a property of numbers that are the product of exactly two prime numbers. A number n is biprime if it can be expressed as n = p q, where p and q are prime numbers. The primes p and q may be the same. For example, 6 is biprime because it is 2 3, and both 2 and 3 are prime. Similarly, 9 is biprime because it is 3 3, and 3 is a prime number. Numbers that are the product of two distinct primes are sometimes called distinct biprimes.
The sequence of biprime numbers starts with 4, 6, 9, 10, 14, 15, 21, 22, 25, 26,
The study of biprimes is relevant in various areas of number theory and cryptography. For instance, the