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

[Paul D Hanna]

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.

-- 
Don Reble  djr at nk.ca


--
Seqfan Mailing list - http://list.seqfan.eu/