This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A140399 #9 Jun 23 2021 09:43:59 %S A140399 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 A140399 72,75,77,80,85,88,90,93,98,101,103,106,109,111,114,119,122,124,127, %U A140399 130,132,135,140,143,145,148,153,156,158,161,164,166,169,174,177,179,182 %N A140399 Numbers n such that A140397(n) = 1. %C A140399 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 A140399 nonn %O A140399 1,2 %A A140399 _Fred Lunnon_, Jun 20 2008 %E A140399 More terms from _Max Alekseyev_, Apr 24 2010