{
  min = 1
  max = 20

  step = [2, 3, 5, 7, 11, 13, 17].reduce do |acc, el|
    acc * el
  end

  (step..(step * step)).step(step).detect do |i|
    (min..max).all? do |j|
      i % j == 0
    end
  end