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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
).
External links
MathWorld: Semiprime