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Here is a pdf that looks very basic to start with. I would skip the section of continued fractions unless you want to read original Euler papers, but it looks quite interesting.TensorCalculus said:Oh, okay. Thanks that does clarify it - so this is probably not the book I am looking for.
Maybe I'll just find some resources online that explain ring theory and Eisenstein integers, without proving the n=3 case (since I want to do that myself). This is proving much more difficult than I could have even imagined... it's so interesting that such a simple statement requires such (in the eyes of a student like me) complex methods to prove...
https://resources.saylor.org/wwwres...-Introductory-in-Elementary-Number-Theory.pdf
Search key: "Introduction to elementary number theory + pdf".
Here is one about Eisenstein numbers. How difficult depends on where you want to stop reading it.
https://www.diva-portal.org/smash/get/diva2:1728553/FULLTEXT01.pdf
I searched but couldn't find FLT for n=3 in it, so it should be safe to read, and it has many interesting facts about Eisenstein numbers. But be warned, things can get complicated. I'm not sure whether I would confront a young man with characters on his first encounter with number theory; however, they are an essential tool.
Search key: "Eisenstein numbers + pdf"
Maybe I should have used "Introduction to Eisenstein numbers + pdf" instead.
Only the "+ pdf" part is really important. You get lecture notes and stuff like that rather than colourful websites.