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I love when primality is useful. Like cicadas. But 9 is not prime.

Whoops I meant to write 11, not 9. I haven't actually heard of an 11-bladed screw, though here's a picture of an 11-bladed pumpjet. https://youtu.be/ugSEIiTZ1Pg?t=386

In wartime it is, and also equals to pi squared.

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