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