I was obtaining 34 for 7e4 too, but it's not a problem of the test suite. It just means that your code is not testing all possible combinations (and there are probably other numbers that will fail too). There is no known algorithm to generate the list of integer complexity (https://oeis.org/A005245), which means brute force is the only way to be sure. And brute force finds 32 for 7e4.
It someone doesn't believe 7e4 = (1+1)*(1+1)*(1+1)*(1+1)*(1+ (1+1)*(1+1+1)*(1+1+1)*(1+1+1)*(1+1+1)*(1+1+1)*(1+1+1)*(1+1+1)) (32 ones). Or 2^4*(1 + 2*3^7).
middleAsColumn: Return all but first and last element as a column vector
Change the sign of even index entries of the reversed vector
expand intervals vol.2
Fast 1-D Convolution (same shape)
Cody meets Xiangqi: foresee the unseen (Part 2)
Generating random matrix with given probability mass function
Fast 1-D Convolution (valid shape)
Apply Function to Each Field of a Structure Array: Part 2
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