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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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List of mathematical topics (S-U) | List of number theory topics
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