[seqfan] Re: defn of A032452 transients in modified Poulet
John Machacek
jmachacek.math at gmail.com
Sat May 9 05:30:17 CEST 2020
Hi,
I believe it is iterates of phi, sigma, phi, phi, sigma, phi, phi, sigma,
phi,... until reaching 1 for each positive integer n=1,2,3,4.... When going
to the next integer we "skip" that integer and start with phi(n).
Here is A032452 split in this way.
1,
1,
2, 3, 2, 1,
2, 3, 2, 1,
4, 7, 6, 2, 3, 2, 1,
2, 3, 2, 1,
6, 12, 4, 2, 3, 2, 1,
4, 7, 6, 2, 3, 2, 1,
6, 12, 4, 2, 3,...
Notice the first entry in each row is phi(n). The SageMath code below
reproduces A032452.
Best,
John
N = 10
n = 1
seq = []
while n < N:
a = euler_phi(n)
seq.append(a)
i = 0
while a != 1:
if i%3 == 0:
a = sigma(a)
else:
a = euler_phi(a)
seq.append(a)
i += 1
n += 1
On Fri, May 8, 2020 at 9:53 PM Neil Sloane <njasloane at gmail.com> wrote:
> All those sequences have a (free) link to the paper - see under the LINKS
> section!
>
> 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 Fri, May 8, 2020 at 7:51 PM Tom Duff <td at pixar.com> wrote:
>
> > Got it here: http://iq0.com/alaoglu-erdos-conjecture.pdf
> > It's only two pages.
> >
> > On Fri, May 8, 2020 at 4:28 PM Marc LeBrun <mlb at well.com> wrote:
> > >
> > > >=Neil Sloane
> > > > I thought some more about this problem, without success.
> > >
> > > Perhaps if someone has access to that Alaoglu & Erdös reference it
> might
> > help?
> > >
> > >
> > > --
> > > Seqfan Mailing list - http://list.seqfan.eu/
> >
> > --
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> >
>
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