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%I #7 Apr 05 2019 15:28:11
%S 12,48,77,84,120,156,192,228,264,293,300,336,372,408,467,480,509,516,
%T 552,588,624,660,696,725,732,768,804,840,876,912,941,948,984,1020,
%U 1056,1092,1128,1157,1164,1200,1236,1272,1308,1344
%N Numbers n such that string 2,0 occurs in the base 6 representation of n but not of n+1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,6],{2,0}]>0,1,0],{n,1500}],{1,0}][[All,1]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Apr 05 2019 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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