This one should work for all of the test cases except that you have some numerical precision issues with the last test case. Please replace it with a numerical comparison that takes into account precision (my code is returning numbers with no decimal point but the test code returns something less pretty).
Project Euler: Problem 16, Sums of Digits of Powers of Two
Swap the input arguments
Find the sum of the elements in the "second" diagonal
Find a Pythagorean triple
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