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.
Back to basics 9 - Indexed References
frame of the matrix
Number Puzzle - 044
Number Puzzle - 058
Volume of Cylindrical Shell
Number Puzzle - 099
Number Puzzles - 014
Mass Conversion 2
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