%I #7 Aug 27 2024 17:12:34
%S 41,141,241,341,410,441,541,641,741,841,941,1041,1141,1241,1341,1410,
%T 1441,1541,1641,1741,1841,1941,2041,2141,2241,2341,2410,2441,2541,
%U 2641,2741,2841,2941,3041,3141,3241,3341,3410,3441
%N Numbers n such that string 4,1 occurs in the base 10 representation of n but not of n-1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n],{4,1}]>0,1,0],{n,3500}],{0,1}][[;;,2]] (* _Harvey P. Dale_, Aug 27 2024 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_