could anyone give me a hand with these ;3. xoxox
(1) Show that if you multiply 2 integers of the form 6j + 1 together, you get another integer of that form.
(2) Show that there are infinitely many primes of the form 6j + 5.
This is the hint: Try modifying the proof that there are infinitely many primes. Instead of considering p1 × . . . × pn + 1, consider some other integer constructed from p1 × . . . × pn that will certainly be congruent to 5(mod 6).
(3) Show that if p and p + 2 are both prime and p >= 5, then 6 must divide p + 1.
This is the hint: What congruence classes modulo 6 can p and p + 2 belong to?