[seqfan] Re: Claude Lenormand and raboter(n)

Neil Sloane njasloane at gmail.com
Sun Sep 9 07:25:10 CEST 2018

So A175046 is a kind of inverse transformation to A318921!  Thanks,
Andrew, very nice!
I've created A318922, ...923, ...924 applying the A318921
transformation to Fibonaccis, primes, binary Campernowne,
It might be interesting to see what A175046 does to those same three
sequences, if anyone would like to investigate.

Inspired by your email, I also created the companion  A318925, defined
by a(n) = A175046(A318921(n)). (Needs more terms)

Since Claude Lenormand used <<raboter>> to describe what is now
A318921, I guess A175046 would be <<agrandir>>?

As I said in my earlier message today, I haven't heard from him for
about 15 years.  Which was before
the OEIS became a wiki, and perhaps even before this mailing list was
created. Claude, are you there?
There was an obituary for someone of that same name earlier this year,
which makes me worry.
Best regards

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 Sat, Sep 8, 2018 at 10:52 PM, Andrew Weimholt
<andrew.weimholt at gmail.com> wrote:
> A318921(A175046(n)) = A001477(n)   :-)
> Andrew
> On Sat, Sep 8, 2018 at 10:22 AM Neil Sloane <njasloane at gmail.com> wrote:
>> Dear Seq Fans,
>> I came across an unpublished article by my old friend Claude Lenormand,
>> which led me to a new French word (raboter) and a new sequence, A318921.
>> (He was at the eparty for 100000 sequences - you can see his picture there)
>> He contributed a lot to the OEIS around 2001-2003, but I suspect he is
>> no longer with us. His email does not answer.
>> The response from the remote server was:
>> 550 5.2.1 This mailbox has been blocked due to inactivity
>> Did any of you know him?
>> A318921 sounds pretty good: it could be a dirge for his memory.
>> One could apply the transformation n -> A318921(n) = raboter(n) to
>> any sequence. I created two examples, A319922 and A318923 (Fibonacci
>> and primes).
>> Some time I will scan his article, and add it to A318921.
>> --
>> Seqfan Mailing list - http://list.seqfan.eu/
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