A043989 - OEIS

%I #11 Nov 03 2024 17:41:30

%S 44,76,125,157,206,238,287,319,368,404,449,481,530,562,611,643,692,

%T 724,773,805,854,886,935,967,1016,1048,1097,1133,1178,1210,1259,1291,

%U 1340,1372,1421,1453,1502,1534,1583,1615,1664,1696

%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,1700}],{1,0}] [[;;,1]] (* _Harvey P. Dale_, Nov 03 2024 *)

%Y Cf. A007095.

%K nonn,base,changed

%O 1,1

%A _Clark Kimberling_