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Additional information

Matt Parker discusses multiplicative persistence.

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Extra footage: https://youtu.be/E4mrC39sEOQ

Matt's new book is Humble Pi: http://bit.ly/Humble_Pi

More Matt videos on Numberphile: http://bit.ly/Matt_Videos

The Multiplicative record holders: https://oeis.org/A003001

More info: http://mathworld.wolfram.com/MultiplicativePersistence.html

Hear Matt on the Numberphile podcast... http://bit.ly/Numberphile_Pod_Playlist