These are notes on elementary number theory; that is, the part of number theory which does not involves methods from abstract algebra or complex variables.
The first link in each item is to a Web page; the second is to a PDF file. Use the PDF if you want to print it.
[June 28, 2019] These notes were revised in Spring, 2019. I revised the sections on infinite continued fractions and periodic continued fractions after the term during May and June. I'm planning to add sections on purely periodic continued fractions and continued fractions for radicals, and expand the sections on the Fermat-Pell equation.
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