sorry for asking the same question in a slightly different angle, I want a book in Category Theory similar to Dummit and Foote's book in Abstract Algebra. I want it to have tons of examples and problems, and I want it to be the sort of book in which you always have an idea about what the next results are going to be. Something I really liked about Dummit and Foote is I understood what was going on the first time I read it, but when I read it a second time I felt a lot better than the first time (I'm looking forward to a third).

Sorry if this just sounds like a lost of demands, I just wanted to give some information about what I was looking for.

Thank you kindly

Regards.
['https://math.stackexchange.com/questions/865659', 'https://math.stackexchange.com', 'https://math.stackexchange.com/users/33907/']
I definitely recommend [Number Theory by George Andrews](http://books.google.com.mx/books?id=eVwvvwZeBf4C&printsec=frontcover&dq=number+theory+andrew&hl=es-419&sa=X&ei=5PPBU67CHYiV8gHz64Bw&redir_esc=y#v=onepage&q=number%20theory%20andrew&f=false). It's a very comprehensive book, short sweet and cheap. his writing style and his ability to look at results from different angles is excellent. It's a very enjoyable book.
I'm enjoying this library book, Introduction to Number Theory by Daniel E. Flath. Pretty similar topics to the type of answers I generally give on MSE. It really is pretty basic, but I do think a semester of abstract algebra (groups, rings, fields) and one of linear algebra/matrix theory would help. I ordered a used copy online for myself, inexpensive.