Hi,I have one question for you guys because I try but didn't quite work.Last week one of professor asked me a question . he asked me this. Think of a number (a positive integer), If it's odd, muliply by three and add one. If it's even, divide by two. Repeat this proces. like this one : 3 becomes 10 becomes 5 becomes 16 becomes 8 becomes 25 becomes .........etc Do you always reach 1 at some point Or are there any numbers which never reach 1? And finally I try to find this idea in the internet but I didn't get what trying to say.