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It looks so wrong (sh.itjust.works)
submitted 2 weeks ago by sjmarf@sh.itjust.works to c/whitepeopletwitter@sh.itjust.works
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[-] elvith@feddit.org 22 points 2 weeks ago

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 weeks ago* (last edited 2 weeks ago)

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 weeks ago

Also

Ends in 0,

but that's covered by 5 really.

[-] sugar_in_your_tea@sh.itjust.works 7 points 2 weeks ago

It's also covered by being even.

this post was submitted on 11 Dec 2024
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