Write the following story on the board. You might suggest that students think about the similarities and differences between the two lists.
Begin with 1 and keep doubling it (1, 2, 4, 8…), writing down each number until you have a list of at least 10 numbers (including 1). Now make a list of the first 10 or so square numbers beginning with 1. What can you say about the patterns in both lists?