This chapter in Alex Bellos’s book is a fascinating riff on the psychology of numbers. Why is 11 more interesting than 10? Why is 24 more hygienic than 31? Why is 7 the world’s favourite number? Why should a shopkeeper charge £22-99, but a restaurateur charge £23?
The rest of the book is also interesting if you like maths, but Chapter 1: Every Number Tells a Story is all about how numbers work in the human mind.
Chapter 1 in Alex Through the Looking Glass, by Alex Bellos.