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I always felt that 21 should be, but nooo. Stupid 7
8 2 Reply21 should be
2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)
4 0 Reply9+1 = 10, therefore 91 is divisible by 10 and is not a prime ... QED, I guess
6 4 ReplyIn the right base, that might work.
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