Guy, Richard K.
Unsolved problems in number theory / [by] Richard K. Guy. - New York : Springer-Verlag, 1981. - xviii, 161 p. - Unsolved problems in intuitive mathematics ; v.1 .
0387905936
Number theory.
Unsolved problems in number theory / [by] Richard K. Guy. - New York : Springer-Verlag, 1981. - xviii, 161 p. - Unsolved problems in intuitive mathematics ; v.1 .
0387905936
Number theory.