On 2018.05.17 13:14:26, you,
the extraordinary Roger Hui, spake thus:
<...>
>
> One way to think about index origin, is to consider the question whether 1
> is a prime. http://www.jsoftware.com/papers/APLDesignExercises1.htm#14
>
Aeons ago, in _Quote Quad_, there was a paper, "The Prime Factors of 1".
Answer: i.0
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