"Prime numbers are what is left when you have taken all the patterns away. I think prime numbers are like life. They are very logical but you could never work out the rules, even if you spent all your time thinking about them."

--Christopher John Francis Boone, the fictional 15-year-old autistic narrator of Mark Haddon's the curious incident of the dog in the night-time. This is the final paragraph of the 19th chapter of a novel full of mathematical candy, for those who like to feast upon that sort of thing.