this post was submitted on 11 Dec 2024
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[–] sugar_in_your_tea@sh.itjust.works 15 points 1 week 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.

[–] Knock_Knock_Lemmy_In@lemmy.world 2 points 6 days ago (1 children)

Also

Ends in 0,

but that's covered by 5 really.

It's also covered by being even.