[seqfan] Re: Recaman's transform of the odd numbers

[Charles Greathouse]

As I understand it, you subtract if the result is positive and not
already in the sequence, but otherwise you add and put the result in
the sequence, even if it's already present.

Charles Greathouse
Analyst/Programmer
Case Western Reserve University

On Tue, Mar 6, 2012 at 12:44 PM, Eric Angelini <Eric.Angelini at kntv.be> wrote:
> Hello SeqFans,
> I'm having troubles with https://oeis.org/A128204
>
> 0, 1, 4, 9, 2, 11, 22, 35, 20, 3, 22, 43, 66, 41, 14, 43, ...
> I see two times "22" and two times "43" here. Is it allowed?
>
> Shouldn't the sequence start:
>
> 0, 1, 4, 9, 2, 11, 22, 35, 20, 37, ... with a new definition?
> (like: erase the last term leading to a contradiction and try
> adding instead of subtracting? Such a term would be "3", in
> the above sequence).
>
> ----------
>
> This new definition would be useful to compute a Recaman's
> variation I don't see in the database -- the "Recaman's
> transform of the even numbers":
>
> 1 3 7 13 5  15  27  41  25  43  23  45  21  47  19  49 (and not 11)
>  2 4 6  8 10  12  14  16  18  20  22  24  26  28  30  32 ...
>
> Best,
> É.
>
>
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