Test 4 is wrong; y_correct should be [1; 2; 4]
I´m afraid all tests are correct. But thanks anyway!
Determine if input is odd
Extract leading non-zero digit
Whether the input is vector?
Getting the indices from a vector
Check if is a square
Sum of a geometric series
Ratio between sum of primer numbers and non-prime numbers
Ratio between sum of primes and sum of factors
Approximate the inverse tangent by power series
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