[seqfan] Re: A269526, an infinite Sudoku-type array

jean-paul allouche jean-paul.allouche at imj-prg.fr
Fri Jul 1 00:43:48 CEST 2016


Hi
May be you'll find something in this direction at
http://www.geocities.ws/sarkaria_2000/RootsFunctions.pdf

best wishes
jean-paul


Le 30/06/16 à 21:34, Paul D Hanna a écrit :
> Nice observation, Don.
>     
> I think it is interesting that, if a(n) = A065189(n), then the following 'almost' holds:
>    
>       a(a(a(a(n)))) = n
>     
> That causes me to wonder if someone knows of a non-trivial example of such a sequence.
>   
> Question:
> Is there a non-trivial permutation of the natural numbers a(n) such that  a(a(n))  results in a self-inverse permutation?
>   
> Surely there are several examples of such a sequence in the OEIS ...
>
> ---------- Original Message ----------
> From: Don Reble <djr at nk.ca>
> To: Sequence Fanatics Discussion list <seqfan at list.seqfan.eu>
> Subject: [seqfan] Re: A269526, an infinite Sudoku-type array
> Date: Thu, 30 Jun 2016 00:10:13 -0600
>
>
>> There are a lot of other related sequences, for example, in row n, where
>> does 1 appear?
>      A065189. See also A065188.
>



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