Doddy, the test suite does not check that the numbers are prime and five-digit. I recommend including assert(all(isprime(a)) && all(a > 9999 & a < 1e5)).
@ChrisR: your suggested tests have been added.
Add two numbers
Inner product of two vectors
Find last zero for each column
Square root of a number
Number Puzzle - 068
Perimeter of a quadrilateral
Number Puzzles - 013
Number Puzzle - 028
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