// Part 1 about the 3n+1 conjecture//==================================object CW6a {def collatz(n: Long): Long = if (n == 1) 1 else if (n % 2 == 0) 1 + collatz(n / 2) else 1 + collatz(3 * n + 1)def collatz_max(bnd: Long): (Long, Long) = { val all = for (i <- (1 to bnd.toInt).toList) yield collatz(i) val max = all.max (max, all.indexOf(max) + 1)}}