I'm hoping there is a built-in function I don't know about that solves this problem. Perhaps accumarray?
Create One Large Eye of size N x N Quickly?
"Low : High - Low : High - Turn around " -- Create a subindices vector
How long is the longest prime diagonal?
Arrange vector in ascending order
Cell Source Index
Reference Index Number
middleAsColumn: Return all but first and last element as a column vector
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