599
It looks so wrong
(sh.itjust.works)
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this post was submitted on 11 Dec 2024
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The digit sum of 51 is 6, which is divisible by three. So 51 is also divisible by three. It’s not even hard to see that it’s not prime.
Yup, my personal prime check is:
If it fails all three and it's not an "obvious" prime (<20), then it's prime enough for me.
Also
Ends in 0,
but that's covered by 5 really.
It's also covered by being even.