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submitted 1 month ago by threelonmusketeers@sh.itjust.works to c/mathmemes@lemmy.blahaj.zone

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[-] erie09@lemmy.world 6 points 1 month ago

I always felt that 21 should be, but nooo. Stupid 7

[-] threelonmusketeers@sh.itjust.works 4 points 1 month ago* (last edited 1 month ago)

21 should be

2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)

[-] BigDanishGuy@sh.itjust.works 1 points 1 month ago

9+1 = 10, therefore 91 is divisible by 10 and is not a prime ... QED, I guess

[-] humorlessrepost@lemmy.world 2 points 1 month ago

In the right base, that might work.

this post was submitted on 22 Sep 2024

104 points (97.3% liked)

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