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

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

Unsolved Problems in Number Theory [Unsolved Problems in Intuitive Mathematics]

Unsolved Problems in Number Theory (Problem Books in Mathematics), Guy, Richard,

Unsolved Problems in Number Theory (Problem Books in Mathematics, 1) by Guy

Problems in Algebraic Number Theory (Graduate Texts in Mathematics, 190)

Unsolved Problems in Number Theory by Richard K Guy: Used

Problems in Algebraic Number Theory (Graduate Texts in Mathematics, 190), Murty,