this post was submitted on 11 Dec 2024
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It looks so wrong (sh.itjust.works)
submitted 2 years ago by sjmarf@sh.itjust.works to c/whitepeopletwitter@sh.itjust.works
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[–] elvith@feddit.org 22 points 2 years 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@sh.itjust.works 15 points 2 years ago* (last edited 2 years 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.

[–] Knock_Knock_Lemmy_In@lemmy.world 2 points 2 years ago (1 children)

Also

Ends in 0,

but that's covered by 5 really.

[–] sugar_in_your_tea@sh.itjust.works 7 points 2 years ago

It's also covered by being even.