Sha256: 735364a2652283095e7676acabdd861fccf57178412b452e3dda642303fd2ed0

Contents?: true

Size: 277 Bytes

Versions: 6

Compression:

Stored size: 277 Bytes

Contents

class Integer
  def goldbach?
    return false unless even? and self > 2
    #downto(2).any?{|n| n.prime? and (self - n).prime?}
    Prime.each do |prime|
      next if prime == 2
      return true if (self - prime).prime?
      return false if prime >= self
    end
  end
end

Version data entries

6 entries across 6 versions & 1 rubygems

Version Path
numb-0.186.0 lib/numb/goldbach.rb
numb-0.185.0 lib/numb/goldbach.rb
numb-0.184.0 lib/numb/goldbach.rb
numb-0.181.0 lib/numb/goldbach.rb
numb-0.170.0 lib/numb/goldbach.rb
numb-0.152.0 lib/numb/goldbach.rb