Number Theory Books I'm interested in general in all number theory, but especially in solving diophantine equations and expressions with $\bmod$. Someone can advise me few books or web sites where I could find more? 
I have found the book: "Fundamentals of number theory" (William J.LeVeque, 1977). It's good?

According to Wikipedia, An Introduction to the Theory of Numbers 
is a classic book in the field of number theory, by G. H. Hardy and E. M. Wright.  
The fourth edition (1975 printing) is available on line.  
The updated sixth edition was published in 2008.
