1. ## Homework

Can you help me with this problem?

I'm a little confused...

"If p is a prime number, prove that the number 27p + 1 is a prime one"

2. Originally Posted by Sidereus Nuncius
Can you help me with this problem?

I'm a little confused...

"If p is a prime number, prove that the number 27p + 1 is a prime one"
This is not true. If p = 3 then 27p + 1 is an even number greater than 2, which is not prime.

-Dan

3. Originally Posted by topsquark
This is not true. If p = 3 then 27p + 1 is an even number greater than 2, which is not prime.

-Dan
Worse than that; if p is any prime greater than 2, then 27p+1 is even and so not prime.

RonL

5. Originally Posted by ThePerfectHacker
Some here did not need to realise it, but knew it

RonL

6. Originally Posted by CaptainBlank
Some here did not need to realise it, but knew it

RonL
This was the first time since many many years ago when I first learned it I seen it used again. Thus, I assumed this is not common knowledge.

7. Hmmmm....

I would've guessed a spell from "Harry Potter."

-Dan