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%I #7 Oct 05 2016 15:38:55
%S 104,204,304,404,504,604,704,804,904,1004,1040,1104,1204,1304,1404,
%T 1504,1604,1704,1804,1904,2004,2040,2104,2204,2304,2404,2504,2604,
%U 2704,2804,2904,3004,3040,3104,3204,3304,3404,3504
%N Numbers n such that string 0,4 occurs in the base 10 representation of n but not of n-1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n],{0,4}]>0,1,0],{n,4000}],{0,1}][[All,2]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Oct 05 2016 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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