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Created November 20, 2013 21:09
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Ruby: Get array of prime numbers.
Raw
foo.rb
(1..100).select {|x| (1..x).select{|y|x%y==0}.size==2 }
=> [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97]
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