Why 7 is Weird

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This video features Dr James Grime on divisibility.

James Grime: https://www.singingbanana.com
His YouTube channel: https://www.youtube.com/user/singingbanana

More James on Numberphile: http://bit.ly/grimevideos

More divisibility on Numberphile: https://youtu.be/yi-s-TTpLxY

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