I'm going to be putting previews of notes for class before the class, then fleshing in the details and possibly adding more or taking away topics from the list, depending on how far we get.
Prime numbers, composite numbers and the number 1 (unit)
relatively prime numbers
shortcuts for divisibility
greatest common divisor (g.c.d.) and least common multiple (l.c.m.) for two numbers
These topics are covered on pages 23 through 28 in the notes.