When I originally watched that skit live on NBC all those years ago. my only reaction was:The skit writers probably just made the up the numbers.
That's the one thing that sketch got wrong, btw. In my experience, most fans refer to the episodes by title, not number. But I guess the number thing played into the joke about Trekkies being obsessed with minutiae.
"Where's the parody? I've encountered those kind of Star Trek fans at science fiction conventions..."