books.google.fr - These three puzzles involve the proof of a basic law governing the world of numbers known to be correct in all tested cases — the problem is to prove that the law is always correct. Includes van der Waerden's theorem on arithmetic progressions, the Landau-Schnirelmann hypothesis and Mann's...https://books.google.fr/books/about/Three_Pearls_of_Number_Theory.html?id=sqtlwPI-iWcC&utm_source=gb-gplus-shareThree Pearls of Number Theory