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This is Numberphile. We mainly post videos about mathematics and just numbers in general.

Erdős–Woods Numbers

Erdős–Woods Numbers

Featuring Dr James Grime on Erdős–Woods Numbers.

James Grime: https://www.singingbanana.com

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

Erdős–Woods Numbers in the OEIS: https://oeis.org/A059756 (and see links to other related sequences, including https://oeis.org/A059757)

Brown Numbers: https://www.youtube.com/watch?v=-Djj6pfR9KU

Imaginary Erdős Numbers: https://www.youtube.com/watch?v=izdZPx89ph4

Winnie the Math Whiz

Winnie the Math Whiz

Solving Seven

Solving Seven