- #1
JonF
- 621
- 1
I was told that all prime numbers (except 2 and 3) could be expressed as 6n +- 1 as long as the result divided by 5 is not another integer.
Is this true? Is there a proof for this (hopefully if possible not going much beyond basic calc, I am only in calc 1).
Is this true? Is there a proof for this (hopefully if possible not going much beyond basic calc, I am only in calc 1).