You really shouldn't give away the answer in the test suite. ;-)
You could change the test suite to something like:
assert (str2num(fliplr(num2str(y))) == y*4);
Although this also sort of gives away one possible solution.
Project Euler: Problem 7, Nth prime
Determine Whether an array is empty
Return the first and last characters of a character array
Product of Array
Ordered pairs of integers (I, J).
Number of o rderd pairs of integers (I,J) that can be formed.
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