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Numbers n such that string 2,3 occurs in the base 5 representation of n but not of n+1.
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%I #7 Nov 01 2022 18:58:35

%S 13,38,63,69,88,113,138,163,188,194,213,238,263,288,313,319,349,363,

%T 388,413,438,444,463,488,513,538,563,569,588,613,638,663,688,694,713,

%U 738,763,788,813,819,838,863,888,913,938,944,974

%N Numbers n such that string 2,3 occurs in the base 5 representation of n but not of n+1.

%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,5],{2,3}]>0,1,0],{n,1000}],{1,0}][[All,1]] (* _Harvey P. Dale_, Nov 01 2022 *)

%K nonn,base

%O 1,1

%A _Clark Kimberling_