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15: Complex, triangular, pernicious, and much more | Moment's Notice

 

Last updated 8/31/2022 at 7:47pm



Fifteen, 15. It’s a complex number. It’s a composite number (formed through multiplication), a deficient number (like all prime numbers, but it’s not prime), a pernicious number (oh, forget it), and a bell number (won’t even try).

It’s a...



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