No matter what natural number you start with , if the number is odd , multiply by 3 and add 1 , and if it is even , divide by 2 , and you repeat this and you will always get 1. Is this really true ?
This is called the "3x+1 Problem" or the "Collatz Problem" and is a difficult problem that has not yet been solved.
For example , 11→34→17→52→26→13→40→20→10→5→16→8→4→2→1.
Let's check from various natural numbers.