this post was submitted on 22 Sep 2024
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Math Memes

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John Conway proves that 91 is the smallest number which looks prime but isn't (www.youtube.com)
submitted 1 month ago by threelonmusketeers@sh.itjust.works to c/mathmemes@lemmy.blahaj.zone
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[–] ShareMySims@sh.itjust.works 19 points 1 month ago* (last edited 1 month ago) (2 children)

Only if you weren't taught (or were, but too long ago lol) the divisible by 3 rule - if the sum of the digits is divisible by 3, so is the whole number. 5+1=6 therefore 51 is divisible by 3! Bonus division rule - if it was also an even number and therefore divisible by 2, you could deduce that the whole number was divisible by 6.

[–] Xtallll@lemmy.blahaj.zone 23 points 1 month ago (2 children)

Actually 51/3! Is 8.5

[–] Cadeillac@lemmy.world 9 points 1 month ago

You bastard

[–] threelonmusketeers@sh.itjust.works 5 points 1 month ago

!unexpectedfactorial@sopuli.xyz

[–] Nougat@fedia.io 4 points 1 month ago (1 children)

Actually, 51 is not divisible by 3!

It is divisible by 3