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A043209 Numbers k such that 4 and 8 occur juxtaposed in the base-9 representation of k but not of k-1. 0

%I #11 Dec 12 2022 17:48:04

%S 44,76,125,157,206,238,287,319,368,396,449,481,530,562,611,643,684,

%T 724,773,805,854,886,935,967,1016,1048,1097,1125,1178,1210,1259,1291,

%U 1340,1372,1413,1453,1502,1534,1583,1615,1664,1696

%N Numbers k such that 4 and 8 occur juxtaposed in the base-9 representation of k but not of k-1.

%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,9],{4,8}]>0||SequenceCount[ IntegerDigits[n,9],{8,4}]>0,1,0],{n,2000}],{0,1}][[All,2]] (* _Harvey P. Dale_, Dec 12 2022 *)

%Y Cf. A007095.

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified April 19 12:14 EDT 2024. Contains 371792 sequences. (Running on oeis4.)