It does, you're just not paying attention. The comment appears over the function that uses those variables; it's not 1,1,1 because they want to hit 1 only once in the sequence 1,3,5,7,9,25,27,49,81,125, etc.

It doesn't explain why it's not 3,1,7 or 3,5,1, but that's because there is no reason for that.