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%I #7 Aug 02 2018 19:37:53
%S 16,65,112,163,212,261,310,359,408,455,506,555,604,653,702,751,784,
%T 849,898,947,996,1045,1094,1141,1192,1241,1290,1339,1388,1437,1484,
%U 1535,1584,1633,1682,1731,1780,1827,1878,1927,1976
%N Numbers n such that string 2,2 occurs in the base 7 representation of n but not of n-1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,7],{2,2}]>0,1,0],{n,2000}],{0,1}][[All,2]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Aug 02 2018 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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