Sieve of Eratosthenes in Scala, using lazy evaluation. Example code in lines 4-5 prints out first 15 primes

gistfile1.txt

def sieve(s: Stream[Int]): Stream[Int] = {
  s.head #:: sieve(s.tail.filter(_ % s.head != 0))
}

val primes = sieve(Stream.from(2))    //infinite lazy stream
println((primes take 15).toList)