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Semiprime
In mathematics, a semiprime is a natural number that is the product of exactly two prime numbers. The two primes in the product may equal each other, so the semiprimes include the squares of prime numbers. Because there are infinitely many prime numbers, there are also infinitely many semiprimes. Semiprimes are also called biprimes,[1] since they include two primes, or second numbers,[2] by analogy with how "prime" means "first".
- ^ Sloane, N. J. A. (ed.). "Sequence A001358". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Nowicki, Andrzej (2013-07-01), Second numbers in arithmetic progressions, arXiv:1306.6424
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