// First Version of Ramanujan's Taxi
  def ramtaxi(n: Long) = {
    for (a <- 1L to n) {
      val a3 = a * a * a
      if (a3 <= n)
        for (b <- a to n) {
        val b3 = b * b * b
          if (b3 <= n)
            for (c <- a + 1 to n) {
            val c3 = c * c * c
              if (c3 <= n)
                for (d <- c to n) {
                val d3 = d * d * d
                  if (d3 <= n && a3 + b3 == c3 + d3) {
                    println(a3 + b3 + " = " + a + "^3 + "
                      + b + "^3 = " + c + "^3 + " + d + "^3")
                  }
                }
            }
        }
    }
  }