[seqfan] Re: A293355

Neil Sloane njasloane at gmail.com
Sun Oct 8 13:07:24 CEST 2017


well, to save time I uploaded the plots, see A127661 and A293355.

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 Sun, Oct 8, 2017 at 2:31 AM, Neil Sloane <njasloane at gmail.com> wrote:

> 6216 certainly looks like it is headed straight to outer space, no
> hesitation at all.  Remarkable.
>
> How big is that file?  Can you upload it as an attachment to A293355/
>
> Or I can do it if it is over the limit for a normal upload.  But if that
> is the case, could you get it started by creating the link and attempting
> to upload the png file?  Let me know how it goes.
>
> 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 <(732)%20828-6098>; home page: http://NeilSloane.com
> Email: njasloane at gmail.com
>
>
> On Sat, Oct 7, 2017 at 10:58 PM, Hans Havermann <gladhobo at bell.net> wrote:
>
>> https://oeis.org/A293355
>>
>> Infinitary aliquot sequence starting at 6216. Without really
>> understanding the details of infinitary aliquot sequences, I was
>> nevertheless charting the unknown lengths (less than 10000) of A127661
>> using the Mathematica code provided therein. I eventually determined that
>> there were 12 primary unknowns with an additional 349 merging into them. I
>> graphed those 12 evolutions here:
>>
>> http://chesswanks.com/num/a127661(12unknowns).png
>>
>> You may have to click on it to see the graphs full size. The 7th one down
>> is 6216. You can understand why I wanted to submit the sequence. Unlike the
>> other 11 it appears that it might be provably infinite! Starting at a(22)
>> the terms to a(250) are monotonically increasing and divisible by 120.
>> Perhaps someone here can figure this out.
>>
>>
>> --
>> Seqfan Mailing list - http://list.seqfan.eu/
>>
>
>


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