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%I #7 Jul 09 2021 17:26:55
%S 17,33,49,65,71,81,97,113,129,135,145,161,177,193,199,209,225,241,257,
%T 263,287,289,305,321,327,337,353,369,385,391,401,417,433,449,455,465,
%U 481,497,513,519,543,545,561,577,583,593,609
%N Numbers n such that string 0,1 occurs in the base 4 representation of n but not of n+1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,4],{0,1}]>0,1,0],{n,700}],{1,0}][[All,1]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Jul 09 2021 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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