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).
First N Perfect Squares
Project Euler: Problem 7, Nth prime
Make a random, non-repeating vector.
Equal to their cube
convert matrix to single column
Top layer of a 3D pyramid
cross-section of 3D pyramid
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