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.
Select every other element of a vector
Replicate elements in vectors
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Create an index-powered vector
ASCII Birthday Cake
Sum of big primes without primes
Narcissistic number ?
Numbers spiral diagonals (Part 1)
I want to know everything!
Find Missing Number
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