%I #9 Aug 12 2022 11:26:51
%S 60,141,222,303,384,465,548,627,708,789,870,951,1032,1113,1194,1277,
%T 1356,1437,1518,1599,1680,1761,1842,1923,2006,2085,2166,2247,2328,
%U 2409,2490,2571,2652,2735,2814,2895,2976,3057,3138
%N Numbers n such that string 6,6 occurs in the base 9 representation of n but not of n+1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,9],{6,6}]>0,1,0],{n,3500}],{1,0}][[All,1]] (* _Harvey P. Dale_, Aug 12 2022 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_