If you are using (or considering using) this text for a course or independent study, please let me know. Please do contact me (link on the left) with questions as well.
NEW EDITION POSTED JUNE 26TH, 2024. This is a minor errata update; you can access it now at June 2024 edition. There is also a PRINT VERSION AVAILABLE FOR PURCHASE. All numbering corresponds with the online edition; page numbers may differ by one, as they correspond to the June 2023 edition.
There are two known, very minor errata in the new edition.
These minor update editions has the same links, same content, same chapter summaries as the July 2021 edition. Some new images and new section on combinatorial proofs of famous congruences were added in the January 2021 edition. See download page for two-sided and one-sided pdf options as well - great for printing!
January 2020 edition may still be accessed for continuity at this link; some errata crept in. You may continue to use the much previous edition at this link, but keep in mind its Sage syntax is not up-to-date; see its brief errata list.
This page lists information on some other courses that have used Number Theory: In Context and Interactive. Based on server logs and likely repeat adoptions, I estimate this is one-half to two-thirds of the actual adoptions since the end of the COVID lockdown.
Please let me know if you have adopted the text! Such information helps other consider using open textbooks, as well as being useful to funding agencies supporting software and training for making the process of creating such texts easier for faculty.
Term | School | Location | Instructor | Course |
---|---|---|---|---|
Summer 2025 | University of Indianapolis | Indianapolis, Indiana, USA | Livia Hummel | Math 520 Number Theory |
Spring 2025 | California State University, Channel Islands | Camarillo, California, USA | Jesse Elliott | MATH 482 Number Theory and Cryptograph (partial adoption) |
Spring 2025 | Frostburg State University | Frostburg, Maryland, USA | Mark Hughes | Math 465 |
Spring 2025 | Eastern Connecticut State University | Willimantic, CT, USA | Megan Heenehan | MAT 320 |
Spring 2025 | Eastern Illinois University | Charleston, IL, USA | Alejandra Alvarado | MAT 4910 |
Fall 2024 | Northwest Missouri State University | Maryville, Missouri, USA | Bao Pham | MATH 17618 Number Theory with Applications |
Fall 2024 | Warren Wilson College | Swannanoa, North Carolina, USA | Holly Rosson | MAT 3660 |
Fall 2024 | Boise State University | Boise, Idaho, USA | Zach Teitler | MATH 305 (partial adoption) |
Spring 2024 | University of Colorado, Boulder | Boulder, Colorado, USA | James Rickards | MATH 3110 |
Winter 2024 | Knox College | Galesburg, Illinois, USA | Mary Armon | MATH 217-1 |
Fall 2023 | Northwest Missouri State University | Maryville, Missouri, USA | Bao Pham | MATH 17618 Number Theory with Applications |
Fall 2023 | Boise State University | Boise, Idaho, USA | Zach Teitler | Math 404/504 Number Theory |
Fall 2023 | Boise State University | Boise, Idaho, USA | Zach Teitler | MATH 305 (partial adoption) |
Summer 2023 | University of Indianapolis | Indianapolis, Indiana, USA | Livia Hummel | Math 520 Number Theory |
Spring 2023 | Al Akhawayn University in Ifrane (AUI) | Ifrane, Morocco | Veronique Van Lierde | MTH2199 Special topics in math |
Spring 2023 | National University of Tainan | Tainan, Taiwan | Hsin-Min Sun | 150059 Elementary Number Theory |
Spring 2023 | University of Lethbridge | Lethbridge, Alberta, Canada | Habiba Kadiri | Math 3461 |
Spring 2023 | University of Wisconsin, Eau Claire | Eau Claire, Wisconsin, USA | Mckenzie West | Math 341 |
Spring 2023 | Western New England University | Springfield, Massachusetts, USA | Caleb Shor | MAMT 554 Number Theory |
Spring 2023 | Frostburg State University | Frostburg, Maryland, USA | Mark Hughes | Math 465 |
Spring 2023 | Texas A&M, Commerce | Commerce, Texas, USA | Pani Seneviratne | MATH 437 |
Spring 2023 | University of Utah | Salt Lake City, Utah, USA | Sean Howe | Math 4400 |
Spring 2023 | The College of New Jersey | Ewing, New Jersey, USA | Tom Hagedorn | MAT 301 |
Winter 2023 | University of Western Ontario | London, Ontario, Canada | David Riley | MAT 3150 |
Fall 2022 | California State University, San Bernardino | San Bernardino, California, USA | Jeremy Aikin | MATH 3345 |
Fall 2022 | Midland University | Fremont, Nebraska, USA | Keith Gallagher | MTH300 |
Fall 2022 | St. John Fisher College | Rochester, New York, USA | Mark McKinzie | MATH310 |
Spring 2022 | Sam Houston State University | Huntsville, Texas, USA | Rebecca Garcia | Math 4368 |
Spring 2022 | University of Minnesota, Minneapolis | Minneapolis, Minnesota, USA | Hannah Burson | MATH 5248 |
Spring 2022 | Texas A&M, Commerce | Commerce, Texas, USA | R. Cavender Campbell | MATH 437 |
Spring 2022 | University of Colorado, Boulder | Boulder, Colorado, USA | James Rickards | MATH 3110 |
Spring 2022 | Fort Lewis College | Durango, Colorado, USA | Veronika Furst | MATH 316 |
Spring 2022 | University of Prince Edward Island | Charlottetown, Prince Edward Island, Canada | Shannon Fitzpatrick | MATH 3420 |
Spring 2022 | Fresno Pacific University | Fresno, California, USA | Shawn Wirts | MATH 340 |
Spring 2022 | Dixie State University | St. George, Utah, USA | McKay Sullivan | MATH 3900 |
Fall 2021 | University of Minnesota, Minneapolis | Minneapolis, Minnesota, USA | Hannah Burson, Kris Hollingsworth | MATH 5248 (two sections) |
Fall 2021 | Central Michigan University | Mount Pleasant, Michigan, USA | Ben Salisbury | MTH 521 |
Fall 2021 | Texas A&M University, Corpus Christi | Corpus Christi, Texas, USA | George Tintera | MATH 3313 |
Fall 2021 | University of Redlands | Redlands, California, USA | Sandy Koonce | MATH 245 |
Fall 2021 | Clarks Summit University | Clarks Summit, Pennsylvania, USA | John Best | MA322 |
Fall 2021 | Cleveland State University | Cleveland, Ohio, USA | Federico Galetto | MTH301 (supplemental text) |
Fall 2021 | Azusa Pacific University | Azusa, California, USA | Sharon McCathern | MATH 390 |
Spring 2021 | Frostburg State University | Frostburg, Maryland, USA | Mark Hughes | Math 465 |
Spring 2021 | University of North Carolina, Wilmington | Wilmington, North Carolina, USA | Michael Freeze | MAT 321 |
Spring 2021 | California State University, Stanislaus | Turlock, California, USA | Heather Coughlin | Math 3600 |
Spring 2021 | Georgia Southern University | Statesboro, Georgia, USA | Alina Iacob | MATH 5234 |
Spring 2021 | University of Maryland | College Park, Maryland, USA | Todd Rowland | Math 406 Introduction to Number Theory |
Spring 2021 | Marian University | Indianapolis, Indiana, USA | Matthew DeLong | MAT 335 |
Spring 2021 | Boise State University | Boise, Idaho, USA | Uwe Kaiser | MATH 305 (partial adoption) |
Spring 2021 | Williams College | Williamstown, Massachusetts, USA | Eva Goedhart | Math 313 Introduction to Number Theory |
Spring 2021 | Gordon College | Wenham, Massachusetts, USA | Karl-Dieter Crisman | MAT 338 |
Winter 2021 | Knox College | Galesburg, Illinois, USA | Mary Armon | MATH 217-1 |
Fall 2020 | University of Redlands | Redlands, California, USA | Tamara Veenstra | MATH 245 |
Fall 2020 | University of New Brunswick | Fredericton, New Brunswick, Canada | Neil McKay | MATH 3093 Elementary Number Theory |
Fall 2020 | University of Puget Sound | Tacoma, Washington, USA | Mike Spivey | MATH 345 Number Theory |
Fall 2020 | Southern Connecticut State University | New Haven, Connecticut, USA | Joe Fields | MAT 370 |
Spring 2020 | Western Oregon University | Monmouth, Oregon, USA | Ben Coté | MTH 346 (COVID pivot) |
Spring 2020 | Dordt University | Sioux Center, Iowa, USA | Mike Janssen | Math 207 (COVID pivot) |
Spring 2020 | Fresno Pacific University | Fresno, California, USA | Shawn Wirts | MATH 340 |
Spring 2020 | Dixie State University | St. George, Utah, USA | McKay Sullivan | MATH 3900 |
Fall 2019 | Randolph College | Lynchburg, Virginia, USA | Michael Penn | MATH 337 |
Fall 2019 | Franklin and Marshall College | Lancaster, Pennsylvania, USA | Wendell Ressler | Math 325 |
Fall 2019 | University of Kansas | Lawrence, Kansas, USA | Margaret Bayer | MATH 540 (recommended reading) |
Summer 2019 | University of Kansas | Lawrence, Kansas, USA | Margaret Bayer | MATH 699 (directed study course) |
Spring 2019 | University of Redlands | Redlands, California, USA | Tamara Veenstra | MATH 245 |
Spring 2019 | University of San Francisco | San Francisco, California, USA | Paul Zeitz | MATH 367 |
Spring 2019 | Gordon College | Wenham, Massachusetts, USA | Karl-Dieter Crisman | MAT 338 |
Spring 2018 | University of Redlands | Redlands, California, USA | Tamara Veenstra | MATH 245 |
Spring 2018 | Dixie State University | St. George, Utah, USA | McKay Sullivan | MATH 3900 |
Spring 2018 | Longwood University | Farmville, Virginia, USA | Phillip Poplin | MATH 345 |
Spring 2017 | Gordon College | Wenham, Massachusetts, USA | Karl-Dieter Crisman | MAT 338 |
Spring 2015 | Gordon College | Wenham, Massachusetts, USA | Karl-Dieter Crisman | MAT 338 |