This is a problem where there's probably a good built-in function, but I don't know it.
this will be hard to beat !
Project Euler: Problem 9, Pythagorean numbers
2 b | ~ 2 b
Create an n-by-n null matrix and fill with ones certain positions
Key Generation for Solitaire Cipher
Matrix indexing with two vectors of indices
Fair Scoring for Cody
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