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A044791 Numbers n such that string 7,8 occurs in the base 10 representation of n but not of n+1. 0

%I

%S 78,178,278,378,478,578,678,778,789,878,978,1078,1178,1278,1378,1478,

%T 1578,1678,1778,1789,1878,1978,2078,2178,2278,2378,2478,2578,2678,

%U 2778,2789,2878,2978,3078,3178,3278,3378,3478,3578

%N Numbers n such that string 7,8 occurs in the base 10 representation of n but not of n+1.

%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n],{7,8}]>0,1,0],{n,3600}],{1,0}][[All,1]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, May 02 2020 *)

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified August 14 18:13 EDT 2022. Contains 356122 sequences. (Running on oeis4.)