Contents

class Integer
  def catalan
    (2*self).factorial / (succ.factorial * factorial)
  end

  def catalan?
    n = -1
    loop do
      return true if (cat = (n += 1).catalan) == self
      return false if cat > self
    end
  end
end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
numb-0.152.0	lib/numb/catalan.rb
numb-0.138.0	lib/numb/catalan.rb
numb-0.125.0	lib/numb/catalan.rb
numb-0.114.0	lib/numb/catalan.rb