Question 1024150
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The number of unpainted cubes is the same as the number of cubes it would take to create a similar pyramid where the base is only 8 cubes by 8 cubes, so


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 64\ +\ 49\ +\ 36\ +\ ...\ +\ 4\ +\ 1]


Fill in the missing square numbers and do the sum.


See diagram of the bottom 10X10 layer:


*[illustration BottomLayer.jpg]


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  

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