Semiprime: Difference between revisions
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Semiprime numbers are natural numbers that are products of exactly two (possibly equal) [[prime_number|prime numbers]]. |
Semiprime numbers are natural numbers that are products of exactly two (possibly equal) [[prime_number|prime numbers]]. |
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'''Semiprimes''' are also known as: |
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:::* '''semi-primes''' |
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:::* '''biprimes''' |
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:::* '''bi-primes''' |
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:::* ''' ''2-almost'' ''' primes |
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:::* or simply: ''' ''P<sub>2</sub> '' ''' |
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;Task; |
;Task; |
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Write a function determining whether a given number is semiprime. |
Write a function determining whether a given number is semiprime. |
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;See also: |
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* The Wikipedia article: [http://mathworld.wolfram.com/Semiprime.html semiprime]. |
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* The Wikipedia article: [http://mathworld.wolfram.com/AlmostPrime.html almost prime]. |
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* The OEIS article: [http://oeis.org/A001358 semiprimes] which has a shorter definition: ''the product of two primes''. |
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