Please improve the test suite. There are two glaring problems. First, there is only one test case—it is recommended that at least three be provided, though more are often necessary to prevent hard-coded workarounds. Second, do not provide the solution in the test case(s). For such a problem, the answer should be calculated beforehand and provided as a predefined number to hide the solution. Furthermore, candidate functions can be checked against the solution using an adequate error bound (perhaps within 1E-3) rather than isequal().
Return the 3n+1 sequence for n
Swap the input arguments
Create a square matrix of multiples
Sum the squares of numbers from 1 to n
Calculate area of sector
Automatic String Editing
More Simple String Concatenation
Replace 0 indices in array with 1's
Vector indexing: lower than mean
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