I finally understood the problem by looking at other problems by the author. He is imagining an abstract pyramid made by square matrices of ones that descrease evenly until the top is reached. For instance a squared based pyramid of 19 would make height 10, because its layers are ones(19), ones(17), ones(15), ones(13), ones(11), ones(9), ones(7), ones(5), ones(3), ones(1).
Sums with Excluded Digits
Specific Element Count
Equal to their cube
Make roundn function
Top layer of a 3D pyramid
cross-section of 3D pyramid
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