this post was submitted on 22 Sep 2024
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I always felt that 21 should be, but nooo. Stupid 7
2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)
9+1 = 10, therefore 91 is divisible by 10 and is not a prime ... QED, I guess
In the right base, that might work.