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u(t) is called 60 times per second. t: Elapsed time in seconds. S: Shorthand for Math.sin. C: Shorthand for Math.cos. T: Shorthand for Math.tan. R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5) c: A 1920x1080 canvas. x: A 2D context for that canvas.
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  • pavel: 91 for(d=z=99;z--;i||x.fillRect(960+r/d*C(r),540+r/d*S(r),4,4))for(r=t&&r+1,i=r**.5|0;r%i--;);
  • katkip: u used 3blue1brown video

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remix of d/15836 by u/joe.m

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  • firegodjr: Further optimized the is_prime (F) function. How far can you scroll before timeout? :D #prime
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  • firegodjr: Well, primes are still technically pseudorandom. They don't form a noticeable pattern, per se. This algorithm would possibly work with any consistent pseudorandom number generator, but this pattern is uniquely made up of prime number interactions.
  • lionleaf: Well, non-prime numbers definitely have a pattern that I would expect helps making this very beatiful. For instance ever other number is not prime (even), every 5 number, every 7 number etc. So lot's of regularities.
  • fujimotos: Yeah. I see Math.random() > 0.5 produces a pettern looking nothing but garbled noise. In comparison, the one generated by prime numbers is a Persian carpet.

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