Mark Haddon 在他的小說 The Curious Incident of the Dog in the Night-time 這樣寫著:
Chapters in books are usually given the cardinal numbers 1, 2, 3, 4, 5, 6 and so on. But I have decided to give my chapters prime numbers 2, 3, 5, 7, 11, 13 and so on because I like prime numbers.
質數 (prime number) 是除了 1 與本身之外沒有其他因數的數字,也就是除了 1 與本身之外,沒有其他整數可以整除的數。這是數學領域的課題,生活上會有與此連結的事情嗎?
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