What's special about 277777788888899? - Numberphile (youtube.com)

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Matt Parker discusses multiplicative persistence.

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https://www.youtube.com/@numberphile

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kingdom (biology)

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https://www.reddit.com/r/numberphile/comments/b43u79/whats_special_about_277777788888899_numberphile/

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YouTube video

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https://www.youtube.com/watch?v=Wim9WJeDTHQ

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Wim9WJeDTHQ