4n-1Hello All,

My book says that "There are infinitely many primes of the form 4n-1 and 4n+1". The problem is my book doesn't provide proof that this is true.

I've done some research, and it seems like Dirichlet's Theorem is plausible, but there should be an easier way to understand this that covers both examples.

Can anyone prove both of these in an easy way?

4n+1