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by kragen
1641 days ago
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It's not rule 14. https://en.wikipedia.org/wiki/Elementary_cellular_automaton shows Sierpinski triangles for rules 18, 22, 26, 60, 82, and 90, but only shows the one-cell results for rules <100. https://plato.stanford.edu/entries/cellular-automata/supplem... has a full list, adding 102, 126, 129, 146, 153, 154, 161, 165, 167, 181, 182, 195, 210, and 218, for a total of 20, which is a lot less than a third of 256. (A few more can be coaxed into Sierpinski-triangle behavior with different starting conditions, IIRC.) Rule 22 is the one I was thinking of. |
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