_:nb3992013ec204d6e8295082c2980f063xb0
<http://schema.org/description>
"Dear Uncle Colin, Apparently, $\\sum_1^\\infty \\left(\\frac{n^2}{2^n}\\right) = 6$, which surprised me. Can you explain why? - Some Intuition Gone Missing, Aaargh!"
<https://blog.flyingcoloursmaths.co.uk/ask-uncle-colin-a-surprising-sum/>