An Introduction to Number Theory with Cryptography (Textbooks in Mathematics)
Closing the Gap: The Quest to Understand Prime Numbers
Challenging GCSE Maths Problems: Grade 7 - 9 Exam Preparation : 120 Advanced Questions with Step-by-Step Solutions for Algebra, Geometry, Statistics & More – Master AQA, Edexcel, OCR exam boards
Pi: A Source Book
Cryptography: The All in One Textbook (Haneul Choi Mathematics Textbooks)
The Irrationals: A Story of the Numbers You Can't Count On (Princeton Science Library)
Euclid's Elements Book One with Questions for Discussion
The Penguin Dictionary of Curious and Interesting Numbers (Penguin Press Science)