this post was submitted on 11 Dec 2024
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It looks so wrong (sh.itjust.works)
submitted 1 week ago by sjmarf to c/whitepeopletwitter
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[–] [email protected] 22 points 6 days ago (1 children)

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.

[–] sugar_in_your_tea 15 points 6 days ago* (last edited 6 days ago) (1 children)

Yup, my personal prime check is:

  1. Even?
  2. Ends in 5?
  3. Digits sum to 3?

If it fails all three and it's not an "obvious" prime (<20), then it's prime enough for me.

[–] [email protected] 2 points 6 days ago (1 children)

Also

Ends in 0,

but that's covered by 5 really.

[–] sugar_in_your_tea 7 points 6 days ago

It's also covered by being even.