Blackbox wrote:
So, Is 12472315 Prime? We know that any prime number other than 2 and 3 is of the form 6n+1 or 6n+5, which basically means that number leaves a reminder of 1 or 5 when divided by 6. Correct? So, this checks out for most of the cases but does not for this number... 12472315. This number leaves a remainder of 1 when divided by 6. So, naturally, I thought this number was prime. Guess what....No. It has 5 as its factor. Any idea where I'm going wrong?
First of all there is no known formula of prime
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