Landau's monumental treatise is a virtual encyclopedia of number theory and is universally recognized as the standard work on the subject. The text is in German.

Reviews

"Interest is enlisted at once and sustained by the accuracy, skill, and enthusiasm with which Landau marshals ... facts and simplifies ... details."

-- Bulletin of the AMS

Table of Contents

• Grundlagen der Zahlentheorie
• Brunscher und Dirichletscher Satz
• Zerlegung in zwei, drei und vier Quadrate
• Klassenzahl binärer quadratischer Formen.