Mono Monday- Numbers

This topic brought to mind a favourite book in our house of mathematicians:-  "Numbers" by Richard Phillips. The book contains all sort of interesting facts and fiction about numbers and this shot is of the front cover. 

 I like the quote on the page about number 13:- 
I've dealt with numbers all my life, of course, and after a while you begin to feel that each number has a personality of its own. A twelve is very different from a thirteen, for example. Twelve is upright, conscientious, intelligent, whereas thirteen is a loner, a shady character who won't think twice about breaking the law to get what he wants. Eleven is tough, an outdoorsman who likes tramping through woods and scaling mountains; ten is rather simpleminded, a bland figure who always does what he's told; nine is deep and mystical, a Buddha of contemplation....

 from - Paul Auster , The Music of Chance (1990)