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A140399 Numbers n such that A140397(n) = 1. 4

%I #9 Jun 23 2021 09:43:59

%S 1,4,9,12,14,17,20,22,25,30,33,35,38,41,43,46,48,51,54,56,59,64,67,69,

%T 72,75,77,80,85,88,90,93,98,101,103,106,109,111,114,119,122,124,127,

%U 130,132,135,140,143,145,148,153,156,158,161,164,166,169,174,177,179,182

%N Numbers n such that A140397(n) = 1.

%C Alternatively, those n for which no block of length 3n in the Fibonacci word A003849 forms an abelian cube (that is, a block of the form x x' x'' where x' and x'' are permutations of x). Proved with the Walnut theorem prover. - _Jeffrey Shallit_, Jun 23 2021

%K nonn

%O 1,2

%A _Fred Lunnon_, Jun 20 2008

%E More terms from _Max Alekseyev_, Apr 24 2010

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Last modified March 28 15:28 EDT 2024. Contains 371254 sequences. (Running on oeis4.)