Download PDF version
You can download a pdf version of Number Theory: In Context and Interactive. This includes the same material as the online version.
All known errata fixed in the June 2023 edition, which also has a PRINT ON DEMAND VERSION for the very first time, for students and instructors who desire this. All page numbers and numbering should be identical to the online versions.
The January 2021 edition, along with a number of improvements in various places, included some additional images and a short new section on combinatorial proofs of some famous congruences. The July 2021 edition also added chapter summaries and clarified licensing, among other improvements. There is also a two-sided pdf version of this edition, appropriate for printing and binding. Note that page numbers are identical between both pdfs.
If you are using (or considering using) this text for a course or independent study, please let me know. Also please do contact me (link on the left) with questions.
For those needing reference to it, the 2017/1 edition is still available for now, though it has a few very minor errata, mostly in exercises. The 2020/1 edition is also available, which uses up-to-date Sage commands; some of the few errata are listed here. The 2021/1 edition is also available