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%I #7 Sep 30 2015 11:39:05
%S 9,34,45,59,84,109,134,159,170,184,209,225,259,284,295,309,334,359,
%T 384,409,420,434,459,484,509,534,545,559,584,609,634,659,670,684,709,
%U 734,759,784,795,809,834,850,884,909,920,934,959
%N Numbers n such that string 1,4 occurs in the base 5 representation of n but not of n-1.
%t Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n,5],{1,4}]>0,1,0],{n,1000}],{0,1}]][[2]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* _Harvey P. Dale_, Sep 30 2015 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_