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).
Project Euler: Problem 5, Smallest multiple
How to subtract?
MATCH THE STRINGS (2 CHAR) very easy
Length of a short side
Rotate Matrix @180 degree
cross-section of 3D pyramid
Top layer of a 3D pyramid
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