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%I #7 Jul 25 2019 20:31:10
%S 51,151,251,351,451,510,551,651,751,851,951,1051,1151,1251,1351,1451,
%T 1510,1551,1651,1751,1851,1951,2051,2151,2251,2351,2451,2510,2551,
%U 2651,2751,2851,2951,3051,3151,3251,3351,3451,3510
%N Numbers n such that string 5,1 occurs in the base 10 representation of n but not of n-1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n],{5,1}]>0,1,0],{n,3600}],{0,1}][[All,2]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Jul 25 2019 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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