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%I #12 Mar 14 2022 13:27:08
%S 18,30,67,79,116,126,165,177,210,226,263,275,312,324,361,373,410,422,
%T 459,469,508,520,553,569,606,618,655,667,704,716,753,765,802,812,851,
%U 863,882,949,961,998,1010,1047,1059,1096,1108
%N Numbers k such that 2 and 4 occur juxtaposed in the base-7 representation of k but not of k-1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,7],{2,4}]>0 || SequenceCount[IntegerDigits[n,7],{4,2}]>0,1,0],{n,1200}],{0,1}] [[All,2]] (* _Harvey P. Dale_, Mar 14 2022 *)
%Y Cf. A007093.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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