I like your "calendar" problems serie. They are efficient to understand how Matlab represent dates and times.
Make one big string out of two smaller strings
Convert a vector into a number
Sophie Germain prime
sum of non-primes
How many digits are there?
Matrix multiplication across rows
Find my birthday
Find offset of an element of a multi dimensional matrix
Sum of diagonals elements of a matrix
Broken numlock key, oppps !
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