Divisibility by 3 rule is real. If the sum of the digits of a number is divisible by 3, then the number itself is also divisible by 3. Same goes with 9. There’s an 11 rule, but it’s a bit convoluted.
Seeker of Carcosa
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Cake day: June 28th, 2023
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For me it’s Grothendieck’s prime.