I think what you're looking for are textbooks.

You will have my eternal gratitude if you are kind enough to name one that doesn't suck.

Elementary Analysis: The Theory of Calculus by Ross

IMHO very easy, introductory book on proofs and basic analysis. It's not a novel, you will need some effort to think through exercises.

Getting through this book is like unlocking GODMODE on the first 2 years of college math courses (Calculus mostly).

Rudin, Apostol, Spivak, Lang, Munkres ..

I'd like to say that Apostol's "Introduction to Analytic Number Theory" is bloody awful and is in no way suitable to be an introduction to analytic number theory. A reference book of proofs of some common theorems, yes, but an introduction? No.