[seqfan] Re: The most and least interesting sequences not in OEIS

[Ami Eldar]

The chronology of pi calculation in terms of powers of ten is interesting.
Maybe the years with the names of the persons who calculated the digits can
be included in the comments of A055199
(10^n-th decimal digit of Pi.)?

On Mon, Sep 17, 2018 at 6:46 AM, Keith F. Lynch <kfl at keithlynch.net> wrote:

> Here is the most interesting sequence I know of that is not in OEIS:
>
> 0  -250
> 1  1400
> 2  1706
> 3  1949
> 4  1958
> 5  1961
> 6  1973
> 7  1983
> 8  1987
> 9  1989
> 10 1997
> 11 1999
> 12 2002
> 13 2011
>
> The nth term is when pi was first known to have been correctly
> calculated to at least 10^n decimal places (or the equivalent
> precision in some other notation).  It really shows the astonishing
> progress in computer hardware and software.
>
> The 0th term is very uncertain.  Pi has been known to 10^0 place
> precision for a very long time, but Archimedes is the first person
> known to have *calculated* pi rather than measured it.  I'm not sure
> in which decade he did so, but at least I have the century right.
>
> I wonder what the future of this sequence looks like.  When and what
> will the last term be?  Or will it keep growing literally forever?
>
> It was rejected from OEIS.  I can understand why, since it isn't math,
> even though it's about math.  But then why are A000053 or A007826 there?
>
> And here's the *least* interesting sequence I know of that is not
> in OEIS:
>
> 17,11,19,24,30, 4,17,27,21,23,
> 26, 1, 6, 3, 2, 7,11,10,23,28,
> 27,26,25,30,29,28,27,25, 1,30
>
> The nth term is the day of the month that the nth season of The
> Simpsons began (or will begin) on.  On noticing that the upcoming 30th
> season is to begin on the 30th (of this month), I wondered if the nth
> season had ever begun on the nth of the month before.  The a priori
> odds are about 1 - (29/30.5)^29, which is about 0.77, so I figured it
> most likely happened exactly once before.  And sure enough, it did.
>
> I have not submitted this sequence, and don't intend to.  I did check,
> and sure enough it's not already there.  If someone else wants to
> submit it, feel free to take the credit -- or the blame, as the case
> may be.
>
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