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A043108 Numbers k such that 0 and 3 occur juxtaposed in the base-5 representation of k but not of k-1. 0

%I

%S 15,28,40,53,65,75,90,103,115,128,140,153,165,178,190,200,215,228,240,

%T 253,265,278,290,303,315,325,340,353,365,375,403,415,428,440,450,465,

%U 478,490,503,515,528,540,553,565,575,590,603

%N Numbers k such that 0 and 3 occur juxtaposed in the base-5 representation of k but not of k-1.

%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,5],{0,3}]>0|| SequenceCount[ IntegerDigits[n,5],{3,0}]>0,1,0],{n,700}],{0,1}][[All,2]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Feb 21 2021 *)

%Y Cf. A007091.

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified May 21 00:36 EDT 2022. Contains 353886 sequences. (Running on oeis4.)