I have no idea.

wat.scala

def produceFibList(count: Int, minLen: Int = 16, padding: Char = 'X') = {
  import math.BigInt
  // lazy so that this'll work in the REPL or a worksheet, too
  lazy val fib: Stream[BigInt] = BigInt(0) #:: BigInt(1) #:: fib.zip(fib.tail).map(tup => tup._1 + tup._2)

  def bigIntToStr(b: BigInt): String = {
    def pad(s: String): String = {
      val paddingLen = minLen - s.length
      if(paddingLen > 0)
        (padding.toString) * paddingLen + s
      else
        s
    }
    pad(b.toString(20).toUpperCase)
  }
  fib map bigIntToStr
}

val paddedFibs = produceFibList(100, 16, '0')

paddedFibs take 10 foreach println