This was a fun problem, but I think lookup table solutions are possible given the way the way the test suite is configured. Maybe you could add a string parser to see if the test suite correct solutions are included in the answer code?
Project Euler: Problem 1, Multiples of 3 and 5
Project Euler: Problem 6, Natural numbers, squares and sums.
Is X a Fibonacci Matrix?
Is it a number?
Number of Even Elements in Fibonacci Sequence
Number construction I
Factorizing a number into a given number of factors
Mean number of letters per word (Hard)
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