Not Always Buried Deep: A Second Course in Elementary Number Theory

A Beginner's Guide to Constructing the Universe: The Mathematical Archetypes of Nature, Art, and Science

An Introductory Course in Elementary Number Theory

Steps into Analytic Number Theory: A Problem-Based Introduction

Notebooks of Srinivasa Ramanujan: Volume II, Volume 2

How Numbers Work: Discover the strange and beautiful world of mathematics

A History of Pi

Complex Numbers from A to ... Z: Edition 2

Number Theory: Structures, Examples, and Problems

Ramanujan's Place in the World of Mathematics: Essays Providing a Comparative Study

Proof and the Art of Mathematics

My Search for Ramanujan: How I Learned to Count

Class Groups of Number Fields and Related Topics

God Created The Integers: The Mathematical Breakthroughs that Changed History

Ramanujan’s Notebooks: Part II, Part 2