Dave Dyer <ddyer@real-me.net> wrote:

The line between math and numerology is pretty thin.

Wikipedia says, "Numerology is any belief in the divine or mystical relationship between a number and one or more coinciding events. It is also the study of the numerical value of the letters in words, names and ideas. It is often associated with the paranormal, alongside astrology and similar divinatory arts." I can't find any numerology in my post. The distribution of substrings is pretty much pure math, even if it is contaminated by base-ten cooties. For instance, is there likely to be a *highest* power of two that does *not* contain 2019? How about a highest factorial that doesn't contain it? I find these to be interesting questions. Neil Sloane <njasloane@gmail.com> wrote:

Keith, we do have the sequence 10, 0, 1, 5, 2, 8, 4, 15, 3, 12, 10, 40, 7, ..., which of course you will immediately recognize. It also has an easily remembered A-number, A030000

Thanks. I notice that its value for the 9634th term is wrong. I also calculated a second 10,000 terms. I'll upload them when I get a tuit with fewer corners.