[seqfan] Re: Involving palindromes and sum-of-digits

Neil Sloane njasloane at gmail.com
Mon Aug 22 15:42:49 CEST 2016


That does seem interesting, Yes.  So please add all three sequences to the OEIS!
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 Mon, Aug 22, 2016 at 9:36 AM, Lars Blomberg <larsl.blomberg at comhem.se> wrote:
>
>
> Hello,
>
>
>
> In http://www.primepuzzles.net/puzzles/puzz_041.htm, section B the following
> sequence is defined:
>
>
>
> Palindrome1 / Sum-of-digits(Palindrome1) = Palindrome2.
>
>
>
> First few terms (skipping the trivial 1..9):
>
>
>
> Pal1                     SOD(Pal1)         Pal2
>
> 279972               36                        7777
>
> 2774772             36                        77077
>
> 5499945             45                        122221
>
> 25477452          36                        707707
>
> 27722772          36                        770077
>
> 254545452        36                        7070707
>
> 277202772        36                        7700077
>
> 279999972        63                        4444444
>
>
>
> Is Pal1 sequence of interest?
>
> If so, should Pal2 and SOD(Pal1)  be added as separate sequences?
>
>
>
> Best regards,
>
> Lars B
>
>
> --
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