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%I #7 Oct 29 2017 15:54:40
%S 8,17,24,35,44,51,62,71,89,98,105,116,125,132,143,152,170,179,186,197,
%T 206,213,251,260,267,278,287,294,305,314,332,341,348,359,368,375,386,
%U 395,413,422,429,440,449,456,494,503,510,521
%N Numbers n such that string 2,2 occurs in the base 3 representation of n but not of n-1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,3],{2,2}]>0,1,0],{n,600}],{0,1}][[All,2]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Oct 29 2017 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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