I appreciate how you keep at it even after you found the calendar function! I confess I never knew about calendar.m until today!
Implement a ROT13 cipher
Remove the polynomials that have positive real elements of their roots.
Longest run of consecutive numbers
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
How long is the longest prime diagonal?
Convert hex color specification to MATLAB RGB
Cell Counting: How Many Draws?
The 17x17 Problem
Formatting currency numbers
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