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submitted 9 months ago by [email protected] to c/[email protected]

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[-] [email protected] 6 points 9 months ago

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

[-] [email protected] 5 points 9 months ago* (last edited 9 months ago)

21 should be

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

[-] [email protected] -1 points 9 months ago

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

[-] [email protected] 3 points 9 months ago

In the right base, that might work.

this post was submitted on 22 Sep 2024

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