What was difficult for me to grasp was the primes and unique factorization chapter. I also am just unsure how to know when you do a proof by contradiction or need to prove it two ways. I know that kind of goes back to Math 290 but it has been a while since I have taken that class. Also from the reading it seems to me that 0, +1,-1 are not prime or composite. Is that correct. That's something I have never been really sure about.
Something that I found very helpful was the way to find out if a big number is prime with out dividing it by every number between 0 and itself. The one where n has no prime divisors less than or equal to the square root of n. It could have come in handy in earlier math classes.
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