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"Upon looking at these numbers, one has the feeling of being in the presence of one of the inexplicable                  "   [Don Zagier]               volume 1       volume 2       volume 3 "One of the most remarkable works of maths popularisation that I have read...a brilliantly original work that is both whimsical and cosmically profound. I would recommend it to anyone." Alex Bellos, author of Alex's Adventures in Numberland