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A044066 Numbers n such that string 1,1 occurs in the base 4 representation of n but not of n-1. 0

%I

%S 5,20,37,53,69,80,101,117,133,148,165,181,197,212,229,245,261,276,293,

%T 309,320,389,404,421,437,453,468,485,501,517,532,549,565,581,592,613,

%U 629,645,660,677,693,709,724,741,757,773,788

%N Numbers n such that string 1,1 occurs in the base 4 representation of n but not of n-1.

%t Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n,4],{1,1}]>0,1,0],{n,800}],{0,1}]][[2]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* _Harvey P. Dale_, Nov 28 2015 *)

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified September 20 11:38 EDT 2021. Contains 347584 sequences. (Running on oeis4.)