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Numbers k such that 0 and 6 occur juxtaposed in the base-10 representation of k but not of k+1.
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%I #10 Jun 14 2022 19:15:11

%S 60,106,160,206,260,306,360,406,460,506,560,609,660,706,760,806,860,

%T 906,960,1006,1069,1106,1160,1206,1260,1306,1360,1406,1460,1506,1560,

%U 1609,1660,1706,1760,1806,1860,1906,1960,2006,2069

%N Numbers k such that 0 and 6 occur juxtaposed in the base-10 representation of k but not of k+1.

%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n],{0,6}]>0 || SequenceCount[ IntegerDigits[n],{6,0}]>0,1,0],{n,2100}],{1,0}][[All,1]] (* _Harvey P. Dale_, Jun 14 2022 *)

%K nonn,base

%O 1,1

%A _Clark Kimberling_