I appreciate how you keep at it even after you found the calendar function! I confess I never knew about calendar.m until today!
Find the sum of the elements in the "second" diagonal
Matrix with different incremental runs
Permute diagonal and antidiagonal
Stuff the Board
The 17x17 Problem
How long is the longest prime diagonal?
Give a matrix that matches itself when rotated
Find an inscribed square on a closed curve
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