Math Interest

Answer to the home page question: (5π/3)*(3√2 - 4)
See Weisstein, Eric W. "Sphere-Sphere Intersection." From MathWorld--A Wolfram Web Resource.  This is the link.
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Interesting complex valued function : ${\displaystyle {\sum }_{n=1}^{\infty }{\left(\raisebox{1ex}{$z$}\!\left/ \!\raisebox{-1ex}{$n$}\right.\right)}^n}$

Project Euler

Poker