[seqfan] Re: A055387

[Neil Sloane]

Allan,  You said
> why delete 11?
referring to A225025, right?  The answer is "human error", meaning me.

I will fix it.


Best regards
Neil

Neil J. A. Sloane, Chairman, OEIS Foundation.
Also Visiting Scientist, Math. Dept., Rutgers University,
Email: njasloane at gmail.com



On Sat, Jan 21, 2023 at 10:44 PM Jack Grahl <jack.grahl at gmail.com> wrote:

> It's perhaps worth pointing that that this sequence by (seeming)
> implication also contains 1111111111111111111, 11111111111111111111111,
> etc.
>
> See A004022.
>
> On Thu, 19 Jan 2023, 18:40 Tom Duff, <eigenvectors at gmail.com> wrote:
>
> > Sure, but the fix to the description is silly, something like "Prime
> > numbers, some non-trivial permutation of whose decimal digits is also
> > prime. Also 2, 3, 5, 7 and 11." This is an instance of a general
> > strategy for fixing the descriptions of sequences with extra erroneous
> > terms. But it would be an embarrassment to have OEIS peppered with
> > descriptions like this. We already have a well-sanctioned way to deal
> > with the problem, and that's keyword "dead". The right thing to do is
> > to acknowledge the error, not try to paper it over.
> >
> > On Thu, Jan 19, 2023 at 7:26 AM Allan Wechsler <acwacw at gmail.com> wrote:
> > >
> > > In this case, though, it is in fact easy to tweak the given description
> > so
> > > that it matches the data perfectly. Is that not the least disruptive
> fix?
> > >
> > > On Thu, Jan 19, 2023 at 6:02 AM Neil Sloane <njasloane at gmail.com>
> wrote:
> > >
> > > > Our rule is that if the sequence has only been in the OEIS for about
> a
> > year
> > > > or less, we recycle the A-number, but for older entries we keep the
> > entry
> > > > and add the keyword "dead".  This makes sense because otherwise there
> > would
> > > > be huge numbers of dead entries. We keep a public record of this
> action
> > > > on the OEIS wiki in the file called "
> > > > https://oeis.org/wiki/Deleted_sequences".
> > > >  Take a look at it!
> > > >
> > > > We do take our custodial duties very seriously.
> > > >
> > > > Best regards
> > > > Neil
> > > >
> > > > Neil J. A. Sloane, Chairman, OEIS Foundation.
> > > > Also Visiting Scientist, Math. Dept., Rutgers University,
> > > > Email: njasloane at gmail.com
> > > >
> > > >
> > > >
> > > > On Wed, Jan 18, 2023 at 7:19 PM Marc LeBrun <mlb at well.com> wrote:
> > > >
> > > > > "The OEIS is an archive, and the first principle of archives is
> > > > > permanence."
> > > > >
> > > > > Heh, except that the OEIS recycles A-numbers -- probably not a
> "best
> > > > > practice", but NJAS has pragmatic reasons for doing it (for one,
> not
> > > > > causing big gaps in the sequence when a batch of recently proposed
> > > > > sequences gets rejected) so I guess we'll just have to live with
> it.
> > > > >
> > > > >
> > > > > --
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> > > > >
> > > >
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