Math Memes

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Memes related to mathematics.

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John Conway proves that 91 is the smallest number which looks prime but isn't (www.youtube.com)

submitted 6 months ago by [email protected] to c/[email protected]

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[–] [email protected] 2 points 6 months ago (1 children)

No it's 51

[–] [email protected] 0 points 6 months ago* (last edited 6 months ago) (1 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.

[–] [email protected] 1 points 6 months ago

Actually 51/3! Is 8.5