Semiprime
In mathematics, a semiprime is a number that is the product of two primes.
Examples
is an example of a semiprime as it is the product of two threes.
.
is also an example as it is obtained by
.
Other examples include: ,
,
,
,
, and
.
Counterexamples
Counterexamples include , as it is only a prime number.
is not a semiprime because it can obtained by
or
.