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Featuring Neil Sloane from the OEIS: https://oeis.org

And thanks to Jonathan Wild: https://www.mcgill.ca/music/jonathan-wild

OEIS A250001 - Number of arrangements of n circles in the affine plane: https://oeis.org/A250001

3-Circles T-Shirt: https://teespring.com/three-circles-numberphile
4-Circles Poster: https://teespring.com/four-circles-numberphile
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Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile

We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. https://www.simonsfoundation.org/outreach/science-sandbox/

And support from Math For America - https://www.mathforamerica.org/

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