Get list of elements that are divisible by 3 or 5 from 1 - 1000

Question

I\'m trying to write a functional approach in scala to get a list of all numbers between 1 & 1000 that are divisible by 3 or 5

Here is what I have so far :

Answer 1

The problem from projecteuler.net also wants a sum of those numbers at the end.

"Find the sum of all the multiples of 3 or 5 below 1000."

object prb1 {
  def main(args: Array[String]) {
    val retval = for{ a <- 1 to 999
                      if a % 3 == 0 || a % 5 == 0
    } yield a
    val sum = retval.reduceLeft[Int](_+_)
    println("The sum of all multiples of 3 and 5 below 1000 is " + sum)
  }
}

The correct answer should be 233168