A friendly introduction to number theory 由 Silverman, Joseph H. 1955-

Elementary number theory and its applications 由 Rosen, Kenneth H.

Eta products and theta series identities 由 Köhler, Günter

Available for UP System via SpringerLink.

Problem-solving and selected topics in number theory in the spirit of the mathematical olympiads 由 Rassias, Michael Th

Available for University of the Philippines Diliman via SpringerLink. Click here to access

Discrete mathematics 由 Gallier, Jean H.

Available for UP System via SpringerLink.

Teoria dei numeri lectures given at the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Varenna (Como), Italy, August16-25, 1955

Available for University of the Philippines System via SpringerLink

Advanced number theory with applications 由 Mollin, Richard A. 1947-

Elementary number theory 由 Burton, David M.

Number theory a lively introduction with proofs, applications, and stories 由 Pommersheim, James E. (James Erik) 1967-

Number theory for elementary school teachers 由 Wall, Edward