Puzzle of the Day
Start with any number less than 20. If the number is even, halve it. If the number is odd, add one. Continue using the same rules writing each number one after the other. e.g. 17, 18, 9, 10, 5, 6, 3, 4, 2, 1. Do they always end in 1? What is the longest list of numbers?
Answer: 17 is the longest