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%I #7 Jan 02 2020 13:54:08
%S 18,118,189,218,318,418,518,618,718,818,918,1018,1118,1189,1218,1318,
%T 1418,1518,1618,1718,1899,1918,2018,2118,2189,2218,2318,2418,2518,
%U 2618,2718,2818,2918,3018,3118,3189,3218,3318,3418
%N Numbers n such that string 1,8 occurs in the base 10 representation of n but not of n+1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n],{1,8}]>0,1,0],{n,3500}],{1,0}][[All,1]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Jan 02 2020 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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