In the place of "Find the sum of all products whose...", I would say: "Find the number of all products whose..." ;-)
Why  instead of 0?
Since I have kludged a solution together, can I have a hint?
this solution works on my comupter
I see the first test command line is corrupted
:( :( :(
I've fixed that first line in the test suite. Try it again.
vectorization in N
Reverse the elements of an array
Create an n-by-n null matrix and fill with ones certain positions
Is it a number?
Matrix to column conversion
Return a list sorted by number of consecutive occurrences
Permute diagonal and antidiagonal
Find indices of diagonal elements
Mirror, mirror on the wall, who is fairest of them all?
Divisors for big integer
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