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.
Energy of a photon
Largest Twin Primes
Skip by a multiple
Number Puzzle - 046
Number Puzzle - 072
Number Puzzle - 068
Number Puzzle - 110
Find the Pattern 2
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