Semiprime
In
mathematics, a
semiprime (also called
biprime or
2-almost prime) is a
natural number that is the product of two (not necessarily distinct)
prime numbers. The first few semiprimes are 4, 6, 9, 10, 14, 15, 21, 22, 25, 26, ... (
Sloane's
A001358).
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