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%I #7 Sep 08 2019 14:21:50
%S 13,29,45,55,61,77,93,109,119,125,141,157,173,183,189,205,223,237,247,
%T 253,269,285,301,311,317,333,349,365,375,381,397,413,429,439,445,461,
%U 479,493,503,509,525,541,557,567,573,589,605
%N Numbers n such that string 3,1 occurs in the base 4 representation of n but not of n+1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,4],{3,1}]>0,1,0],{n,700}],{1,0}][[All,1]] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Sep 08 2019 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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