Let n Z. Prove that 3
Chapter 4, Problem 4.7(choose chapter or problem)
Let n Z. Prove that 3 | (2n2 + 1) if and only if 3| n.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer