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%I #7 Dec 09 2015 17:30:24
%S 58,139,220,301,382,463,522,544,625,706,787,868,949,1030,1111,1192,
%T 1251,1273,1354,1435,1516,1597,1678,1759,1840,1921,1980,2002,2083,
%U 2164,2245,2326,2407,2488,2569,2650,2709,2731,2812
%N Numbers n such that string 6,4 occurs in the base 9 representation of n but not of n-1.
%t Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n,9],{6,4}] > 0,1,0],{n,3000}],{0,1}]][[2]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* _Harvey P. Dale_, Dec 09 2015 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_