I have a question in my book as follow:
Use the base 2 test on 511 and 509
(base 2 test is n does not satisfy then it is composite)
For the first part I think I am good:
Noting that so
and is not
However for the second part I get a bit confused:
so
But I am a bot confused as to where to go next.
Thanks for any help
(oh and anybody knows the Latex symbol for not equivalent that would be great)