"math [...] sums seem to always be 0-indexed," What? Is this some kind of trolling challenge? If you don't care about math, just say so. Most people don't. But

"math [...] sums seem to always be 0-indexed," What? Is this some kind of trolling challenge? If you don't care about math, just say so. Most people don't. But making up a nonexistent convention is just silly.