Quote:
Originally Posted by R. Gerbicz
Yes, that is true, since if N denotes your number then N+2 is divisible by 3 and N2 is divisible by 107.

This number isk value so we must find 6 x k and than we must look 6 x k+ 1 and 6 x k  1to check primabilty but how did you calculated 107 easly