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.
Numbers with prime factors 2, 3 and 5.
Set the array elements whose value is 13 to 0
Matrix multiplication across rows
The 5th Root
Number Puzzle - 085
Number Puzzle - 115
Temperature Conversion 1
Number Puzzle - 049
Number Puzzles - 007
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