[seqfan] Re: Add "touching" digits of "n"

[Charles Greathouse]

This sequence has density 1, since all numbers except a thin fraction have
digits 0 through 18 in base 100. In particular, there are at most x^0.99782
non-members up to x for large enough x. No doubt this can be improved.

Charles Greathouse
Analyst/Programmer
Case Western Reserve University


On Thu, Jan 30, 2014 at 9:02 AM, Eric Angelini <Eric.Angelini at kntv.be>wrote:

> Hello SeqFans,
> I think integers like those should deserve a seq.:
>
> 80, 107, 910, 1102, 1459, 41358, ...
>
> When you add two "touching" digits of "n", the result
> is visible in "n".
>
> Example:
> 80 --> 8+0=8
> 107 --> 1+0=1  /  0+7=7
> 910 --> 9+1=10  /  1+0=1
> 1037 --> 1+0=1  /  0+3=3  /  3+7=10
> 1459 --> 1+4=5  /  4+5=9  /  5+9=14
> 41358 --> 4+1=5  /  1+3=4  /  3+5=8  /  5+8=13
>
> Best,
> É.
>
>
>
>
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