[seqfan] Re: A055458: solution to phi(c+46)=c+46 for composite c

Charles Greathouse charles.greathouse at case.edu
Tue Apr 28 21:08:58 CEST 2015


Yes, certainly a-files are welcome for such sequences. I would use ? rather
than -1 in a-files, though, as the values have not been proven to be -1 yet.

Charles Greathouse
Analyst/Programmer
Case Western Reserve University

On Tue, Apr 28, 2015 at 2:56 PM, Robert G. Wilson v <rgwv at rgwv.com> wrote:

> Et al,
>
>         No b text file should use this convention. But an a text file
> could be supplied which does include this convention with no harm. That way
> when certain values are found, they can be reported.
>
> Bob.
>
> -----Original Message-----
> From: SeqFan [mailto:seqfan-bounces at list.seqfan.eu] On Behalf Of Neil
> Sloane
> Sent: Tuesday, April 28, 2015 1:47 PM
> To: Sequence Fanatics Discussion list
> Cc: seqfaneu
> Subject: [seqfan] Re: A055458: solution to phi(c+46)=c+46 for composite c
>
> > I think it an ill practice to insert -1 for unknown values. This way
> > many
> sequences in the OEIS can be "extended" with -1's.
> The sequence should be truncated at the first unknown value.
>
> I totally agree with Max.  I will edit A055458
>
> 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 Tue, Apr 28, 2015 at 12:31 PM, Max Alekseyev <maxale at gmail.com> wrote:
>
> > I think it an ill practice to insert -1 for unknown values. This way
> > many sequences in the OEIS can be "extended" with -1's.
> > The sequence should be truncated at the first unknown value.
> > Regards,
> > Max
> >
> >
> > On Tue, Apr 28, 2015 at 10:43 AM, Richard J. Mathar
> > <mathar at mpia-hd.mpg.de
> > >
> > wrote:
> >
> > > Does anyone have information of the values of A055458 at n=23, 35,
> > > 49, 59, 61,...? Are there composite c such that phi(c+46)=c+46, for
> > > example?
> > >
> > > RJM
> > >
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