Algodoo

You can keep it, since noone can beat THIS primespotter of mine ranging from 1 to about 1000000

Very cool. I downloaded the .jar and ran it. It only took about 7 seconds to generate the pattern. I can now see the diagonals and there appears to be dark vertical line below the origin. Also, on the average, it looks like the density is fairly uniform.

There are in fact Diagonals that appear as if they are the opposite of prime diagonals, areas where not a single prime appears. While the whole area seems to have a uniform density, the center area has a noticable highter density of primes, where as the surrounding area seems lower, but nearly constant. At highter image size( like the one in the jar) one can also see horizontal prime lines, which may contain way less primes than the diagonals, but yet seem to contain a reoccuring pattern of dots. What's also pretty wierd: If you look right next to the right border of the image, start from the corner on the top, and then go about 1 quarter heigth of the image down, you see a small area thats completely devoid of primes. You can find a few more of these areas in the image ,mostly smaller than the one I adressed, but always quite far from the center

I found this page to be very interesting: O.E.I.S. Although some of it is beyond my comprehension, you math wizzes will appreciate it, especially if you have not seen it before.

Thanks.