[seqfan] Re: More fractal trees - and erasures

alexandre wajnberg. alexandre.wajnberg at skynet.be
Sun Jan 4 14:41:39 CET 2015


Magique! :-D
Alexandre ♪
 0476329810


De :  Eric Angelini <Eric.Angelini at kntv.be>
Date :  Sun, 4 Jan 2015 13:00:24 +0100
À :  Sequence Discussion list <seqfan at list.seqfan.eu>
Objet :  More fractal trees - and erasures

> 
> Hello SeqFans,
> 
> Build this easy tree:
>           0
>         1,0,2
>       3,1,0,2,4
>     5,3,1,0,2,4,6
>   7,5,3,1,0,2,4,6,8
> 9,7,5,3,1,0,2,4,6,8,10
> ...
> Get S by concatenating the top row to
> the next one, then to the next one, then
> to the next one, etc.
> 
> S=0,1,0,2,3,1,0,2,4,5,3,1,0,2,4,6,7,5,3,1,0,2,4,6,8,9,7,5,...
> 
> If you erase in S all pairs of consecutive
> integers, you'll get back S.
> 
> Best,
> É.
> 
> 





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