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%I #7 May 03 2019 10:45:30
%S 53,102,151,200,249,298,347,377,396,445,494,543,592,641,690,720,739,
%T 788,837,886,935,984,1033,1063,1082,1131,1180,1229,1278,1327,1376,
%U 1406,1425,1474,1523,1572,1621,1670,1719,1749,1768,1817
%N Numbers n such that string 0,4 occurs in the base 7 representation of n but not of n+1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,7],{0,4}]>0,1,0],{n,2000}],{1,0}][[All,1]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, May 03 2019 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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