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  1. def sieve_of_eratosthenes(max)
  2.   arr=(2..max).to_a
  3.   (2..Math::sqrt(max)).each do |i|
  4.      arr.delete_if {|a|a % i == 0 && a!=i}
  5.    end
  6.    arr
  7. end
  8.  
  9. # Example Call
  10. puts sieve_of_eratosthenes(20)
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https://ideone.com/1h24v
language:
Ruby (ruby 2.5.5)
created:
14 years ago
visibility:
public

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