%I #9 Jul 19 2022 14:32:20
%S 50,131,212,293,374,458,536,617,698,779,860,941,1022,1103,1187,1265,
%T 1346,1427,1508,1589,1670,1751,1832,1916,1994,2075,2156,2237,2318,
%U 2399,2480,2561,2645,2723,2804,2885,2966,3047,3128
%N Numbers n such that string 5,5 occurs in the base 9 representation of n but not of n+1.
%H Harvey P. Dale, <a href="/A044682/b044682.txt">Table of n, a(n) for n = 1..1000</a>
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,9],{5,5}]>0,1,0],{n,3200}],{1,0}][[All,1]] (* _Harvey P. Dale_, Jul 19 2022 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_