Letters and numbers

A row of five letterboxes sitting on a wooden stand surrounded by greenery. The letterboxes are numbered (from left to right): 14, 16, 18, 20, 28.

Image credit: John West


What do you notice about all of these letterbox numbers?

How might you describe the pattern in words?

How might you write this set of numbers using an algebraic expression?

What might be the next number in the sequence?

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