Unsolved Problems in Number Theory (Unsolved Problems in Intuitive Mathematics)

Problem Books in Mathematics: Unsolved Problems in Number Theory by Richard...

Solved and Unsolved Problems in Number Theory, Daniel Shanks

Unsolved Problems in Mathematical Systems and Control Theory by Blondel, Megr...

Solved and Unsolved Problems in Number Theory (CHEL/297) by Daniel Shanks

Solved and Unsolved Problems in Number Theory [CHEL/297]

Solved and Unsolved Problems in Number Theory by Daniel Shanks (1978, HC) 2nd Ed

Old and New Unsolved Problems in Plane Geometry and Number Theory (Dolciani ...