Common Fractions

  def isFraction(a: Int, b: Int): Boolean = a % b == 0

  def fractions(a: Int): List[Int] =
    (1 until a).filter(isFraction(a, _)).toList

  def commonFractions(a: Int*): List[Int] =
    a.map(fractions).reduce(_ intersect _)

  println(commonFractions(100, 250, 125))