[seqfan] Interesting property of A001151

David Wilson davidwwilson at comcast.net
Fri Aug 19 23:38:43 CEST 2011

I believe that in A001151, there is no nonempty finite block of elements 
followed immediately by the same block, e.g, you never see 1,1 or 
1,2,1,2 or 1,3,1,2,1,3,1,2 etc in the sequence.

However, if you prepend the sequence with any positive integer n, the 
first 2^(n-1) elements are repeated.

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