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A044127 Numbers n such that string 4,1 occurs in the base 6 representation of n but not of n-1. 1

%I

%S 25,61,97,133,150,169,205,241,277,313,349,366,385,421,457,493,529,565,

%T 582,601,637,673,709,745,781,798,817,853,889,900,961,997,1014,1033,

%U 1069,1105,1141,1177,1213,1230,1249,1285,1321,1357,1393,1429,1446,1465,1501

%N Numbers n such that string 4,1 occurs in the base 6 representation of n but not of n-1.

%t f[n_] := Length[StringPosition[ToString[FromDigits[IntegerDigits[n, 6]]], "41", 1]]; Select[Table[n, {n, 10000}], f[#] > 0 && f[# - 1] == 0 &] (* _Vladimir Joseph Stephan Orlovsky_, Jul 20 2011 *)

%Y Cf. A044508.

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified June 25 14:54 EDT 2022. Contains 354851 sequences. (Running on oeis4.)