Tree-House Numbers
Matt Parker goes on a mathematician's journey and shows us Heegner Numbers (and the Ramanujan Constant).
See part 1 (Caboose Numbers) here: https://youtu.be/gM5uNcgn2NQ
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Heegner Numbers on the OEIS: https://oeis.org/A003173
Ramanujan Constant: https://mathworld.wolfram.com/RamanujanConstant.html