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%I #7 Nov 14 2018 09:32:14
%S 55,155,255,355,455,559,655,755,855,955,1055,1155,1255,1355,1455,1559,
%T 1655,1755,1855,1955,2055,2155,2255,2355,2455,2559,2655,2755,2855,
%U 2955,3055,3155,3255,3355,3455,3559,3655,3755,3855
%N Numbers n such that string 5,5 occurs in the base 10 representation of n but not of n+1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n],{5,5}]>0,1,0],{n,4000}],{1,0}][[All,1]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Nov 14 2018 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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