A044347 - OEIS

%I #7 Aug 02 2021 10:38:53

%S 15,115,150,215,315,415,515,615,715,815,915,1015,1115,1150,1215,1315,

%T 1415,1500,1615,1715,1815,1915,2015,2115,2150,2215,2315,2415,2515,

%U 2615,2715,2815,2915,3015,3115,3150,3215,3315,3415

%N Numbers n such that string 1,5 occurs in the base 10 representation of n but not of n-1.

%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n],{1,5}]>0,1,0],{n,3500}],{0,1}][[All,2]] (* _Harvey P. Dale_, Aug 02 2021 *)

%K nonn,base

%O 1,1

%A _Clark Kimberling_