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?
Sophie Germain prime
Doubling elements in a vector
Multiples of a Number in a Given Range
Max index of 3D array
Digit concentration in Champernowne's constant
The glass half full
Factorizing a number into a given number of factors
Juggler sequence revisited
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