[seqfan] Re: A228988
Neil Sloane
njasloane at gmail.com
Mon Oct 19 20:09:25 CEST 2015
Guptas's original definition was:
Smallest missing number in first 10^n digits after the ...
This was changed to smallest missing n-digit number by
one of the editors.
Perhaps someone else can fix this, I don't have time today. Remember that
we always try to change the definition to fit the numbers (especially when
the defn was changed by an editor), rather than the other way round. The
numbers take precedence.
Of course we often end up wiith two sequences, not one -- one for the
numbers, the other for the numbers
produced by a literal interpretation of the definition.
Best regards
Neil
Neil J. A. Sloane, President, OEIS Foundation.
11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
Phone: 732 828 6098; home page: http://NeilSloane.com
Email: njasloane at gmail.com
On Mon, Oct 19, 2015 at 10:31 AM, Dave Consiglio <davecons at gmail.com> wrote:
> Hello all,
>
> It seems like A228988 has a fundamental error, but I thought I'd post here
> first to confer before editing the sequence directly. Not sure I'm
> understanding the description.
>
> Shouldn't a(6) should be a 6-digit number? It is currently not. a(7) is
> not a 7-digit number either.
>
> My search gives the following list:
>
> (1, 0)
> (2, 12)
> (3, 103)
> (4, 1001)
> (5, 10000)
> (6, 100000)
> (7, 1000000)
> (8, 10000001)
> (9, 100000000)
>
> Through a(9).
>
> Code attached. To get "pi-billion.txt" you can go to:
> http://stuff.mit.edu/afs/sipb/contrib/pi/pi-billion.txt
>
> There are two related sequences as well (e and phi: A228989 and A228990
> respectively). Are these in error as well?
>
> Thanks,
> Dave Consiglio
>
>
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