Practical Numbers - Numberphile

Featuring Dr James Grime. More links & stuff in full description below ↓↓↓

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Practical Numbers (AKA panarithmic numbers) on the OEIS: https://oeis.org/A005153

James Grime: https://www.singingbanana.com
His YouTube channel:    / singingbanana  
More James on Numberphile: http://bit.ly/grimevideos

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