3-exp clock

Published at 753 × 781 in 7 ways to tell if a number is divisible by 7

The sequence $(1,3,2,6,4,5)$ represented on the mod 7 ‘clock’

David is a final year PhD student at UCL studying geometric group theory. When not doing maths he can usually be found singing or playing the flute.
davidsheard.co.uk/    All articles by David

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