%I #10 Jul 03 2024 11:36:55
%S 11,31,47,66,83,103,119,139,155,175,186,211,227,247,263,282,299,319,
%T 335,355,371,391,396,443,463,479,498,515,535,551,571,587,607,618,643,
%U 659,679,695,714,731,751,767,787,803,823,834,859
%N Numbers k such that 1 and 5 occur juxtaposed in the base-6 representation of k but not of k-1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,6],{1,5}]>0 || SequenceCount[ IntegerDigits[ n,6],{5,1}]>0 ,1,0],{n,900}],{0,1}][[;;,2]] (* _Harvey P. Dale_, Jul 03 2024 *)
%Y Cf. A007092.
%K nonn,base
%O 1,1
%A _Clark Kimberling_