Title: The Man Who Counted (translated from Portuguese)
Author: Malba Tahan
Short description: A mixture of Arabian Nights and a classical puzzlebook. The stories follow a brilliant youth who solves mathematical problems. A highly enjoyable read for anyone who likes oriental tales, and just the right combination of adventures and mathematics for all aunts and nephews out there without a mathematics degree.
Malba Tahan is a pen name of the Brazilian mathematician and writer Júlio César de Mello e Souza. The book was first published as O homem que calculava in 1949.