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Published at 2560 × 1810 in 7 ways to tell if a number is divisible by 7

Testing divisibility for base 10 numbers is all very well and good, but binary is where it’s at

David teaches and researches maths at King’s College London, with a focus on geometry. In his spare time he likes to make music and read poetry.
davidsheard.co.uk/    All articles by David

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