From Zero to Infinity is a combination of number lore, number history, and sparkline descriptions of the simply stated but exceedingly difficult problems posed by the most ordinary numbers. The book first appeared in print in 1955 and has been kept in print continuously ever since. With this fifth edition this classic has been updated to report on advances in number theory over the last fifty years, including the proof of Fermat's Last Theorem. Deceptively simple in style and structure, it is a book to which the reader will return again and again, gaining greater understanding and satisfaction with each reading.