• @Frozengyro
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    51 year ago

    I’m sure every digit has rules to figure it out if you get technical enough.

    • @logicbomb
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      81 year ago

      I looked up a rule for 7, and it seems like it would take about the same amount of time as actually dividing the number by 7.

      Meanwhile, it looks like the rule for 8 is to see if the last 3 digits are divisible by 8, which seems like a real time save for big numbers.