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- The divisors of the integer $m$ are given by travelling diagonally upwards (North East), if a pixel from one of the upper lines is met, then $m$ is divisible by that lines number.\\  - Hence, if there is no filled position between the coordinate $(m,m)$ and $(2m-1,1)$ then that number $m$ is prime!\\  Below, primes are pixels in red on the bottom line, the grey line shows there lines  are paths meeting  no divisors above that number.