Please advice whether below is correct, anything new or useful?
where n, a and b are integers ≥ 1
For $6n - 1$ all numbers will be prime numbers except where $n= 6ab + b - a$
For $6n + 1$ all will be prime numbers except where $n= 6ab ±(b + a)$
I believe the above 2 will capture all the primes above 3.
This is my first post so forgive me if I have made any errors or you feel I am wasting your time.