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+
+
+
+
+
+// ticket #3502
+object Test {
+
+ object GeneratePrimeFactorsLazy extends (Int => List[Int]) {
+ override def apply(n:Int) = {
+ val s = Stream.range(2, n / 2).filter(n % _ == 0)
+ //val s = for (i <- Stream.range(2, n / 2); if n % i == 0) yield i
+ s.headOption.map(x => x :: apply(n / x)).getOrElse(List(n))
+ }
+ }
+
+ def main(args:Array[String]) {
+ // a prime number
+ //val num = 623456789
+ val num = 2796203
+ assert(GeneratePrimeFactorsLazy(num) == List(num))
+ }
+
+}