Semiprime: Difference between revisions
→{{header|Ruby}}: Added Ruby Header and sample
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=={{header|REXX}}==
<lang rexx>/* REXX ---------------------------------------------------------------▼
▲/* REXX ---------------------------------------------------------------
* 20.02.2014 Walter Pachl relying on prime decomposition
*--------------------------------------------------------------------*/
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12 is NOT semiprime 2 2 3
1679 is semiprime 23 73</pre>
=={{header|Ruby}}==
<lang ruby>require 'prime'
# 75.prime_division # Returns the factorization.75 divides by 3 once and by 5 twice => [[3, 1], [5, 2]]
class Integer
def semi_prime?
prime_division.map(&:last).inject(&:+) == 2
end
end
p 9.semi_prime? # true
p 5.semi_prime? # false
p 1679.semi_prime? # true
p 1680.semi_prime? # false</lang
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