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Using your frames here's the sequence as N goes from 2 to 90 with a stride of 2: https://streamable.com/l7r96

This is what I wanted to see! Like others have said this looks like it approaches that image as N grows large.

I really liked your approach. I made a few modifications.

http://htmlpreview.github.io/?https://github.com/acmegeek/pr...

I changed it to render with circles vs squares, and have them stack nicely. Also, have the variables more isolated to test. Also, it counts how many primes are within a pack, and assigns the color proportionately. This is still a work in progress.

I made a version of your program in SmallBASIC: https://raw.githubusercontent.com/smallbasic/smallbasic.gith... I found with packSize less than about 20 the shapes vary, then increasing values of packSize results in two alternating sets of shapes.

So does the pattern work or not? People are saying it's not plotting primes, but there is clearly a prime check in this code

The original pattern uses prime check (as per this code). OP claimed an exact match with http://oeis.org/A054521 - but this isn't true for many N (see vietjtnguyen's streamable). Perhaps it approaches it as N grows large?