[seqfan] Re: Sums of digits of multiples of 11

Neil Sloane njasloane at gmail.com
Sun Jul 27 06:16:28 CEST 2014


Al, if it isn't in the OEIS already, then IMHO we definitely
need it (the reason is, five or so years ago I entered a closely
related sequence which was one of those
which no one had been able to solve, and which was either
really hard or could be solved by a clever trick. I'm on vacation now so
I can't locate it, but it was in
the same ballpark as yours, so please go ahead and enter it!)


On Sun, Jul 27, 2014 at 12:04 AM, Alonso Del Arte <alonso.delarte at gmail.com>
wrote:

> Do we need this sequence?
>
> Sums of base 10 digits of multiples of 11.
> 2, 4, 6, 8, 10, 12, 14, 16, 18 (corresponds to 99), 2 (corresponds to 110),
> 4, 6, 8, 10, 12, 14, 16, 18 (corresponds to 198), 11 (corresponds to 209),
> 4, ...
>
> Though this sequence might already be in the OEIS, if A136614 is not a red
> herring match.
>
> This came up when I answered a question on Math.StackExchange from a fellow
> wondering if any multiples of 99 have digit sums less than 18 (other than
> 0, of course).
>
> Al
>
> --
> Alonso del Arte
> Author at SmashWords.com
> <https://www.smashwords.com/profile/view/AlonsoDelarte>
> Musician at ReverbNation.com <http://www.reverbnation.com/alonsodelarte>
>
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>
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-- 
Dear Friends, I have now retired from AT&T. New coordinates:

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.
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Email: njasloane at gmail.com



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