# File lib/highline/style.rb, line 83
    def self.ansi_rgb_to_hex(ansi_number)
      raise "Invalid ANSI rgb code #{ansi_number}" unless (16..231).include?(ansi_number)
      parts = (ansi_number-16).to_s(6).rjust(3,'0').scan(/./).map{|d| (d.to_i*255.0/6.0).ceil}
      rgb_hex(*parts)
    end