The Art of Modular Arithmetic
Short Tricks of Math (Science Foundation Series)
The Little Book of Numbers
Numbers: 10 Things You Should Know
The Science of Numerology for Beginners: Self-Mastery Secrets and Fadic Number Synchronicities (Short. Simple. Spiritual.)
The Logic of Number Theory Proofs (Proofs in Number Theory Book 2)
Number Theory and Its History (Dover Books on Mathematics)
The Book of Numbers: From Zero to Infinity, An Entertaining List of Every Number That Counts