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.
Triangle Numbers Below N
Energy of a photon
How many trades represent all the profit?
Permute diagonal and antidiagonal
Mirror, mirror on the wall, who is fairest of them all?
Divisors for big integer
Find my secret number
Find indices of diagonal elements
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