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.
Length of a short side
prime test 2
Number Puzzle - 068
Number Puzzle - 101
Number Puzzle - 052
Number Puzzle - 081
Number Puzzle - 022
Number Puzzle - 025
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