A character in the film Gregory's Girl observes that boys seem to be fascinated by numbers. Whether this book, based on Keith Devlin's Guardian newspaper column, will mainly appeal to boys remains to be seen, but its subject is numbers. Within its hundred pages you'll find the quest for the ultimate prime number; strange facts about pi (not the one on the back cover of this magazine) how to calculate the Oxen of the Sun! Computers have played their part in unravelling such numerical teasers, but even if you don't own a Cray-1 there are problems to solve on your humble micro. So if you have a number crunching mind this book is for you, though others may find their heads reel from its mathematical magic. John Minson , PCW
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