I'll be on ShareMySims@lemmy.dbzer0.com

ShareMySims@sh.itjust.works

I guess the clue was in the name, I’m done with this shitty instance,

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Joined 3 years ago

Cake day: February 29th, 2024

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Math Memes@lemmy.blahaj.zone•John Conway proves that 91 is the smallest number which looks prime but isn'tbyI'll be on ShareMySims@lemmy.dbzer0.com@sh.itjust.worksEnglish
2 years
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.