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%I
%S 2,15,18,20,22,24,29,43,63,80,83,84,86,105,126,147,152,155,158,161,
%T 168,189,193,196,199,202,205,208,210,211,214,217,220,223,226,227,229,
%U 230,231,232,233,235,238,241,244,247,250,252,253
%N Position of n-th 3 in A031018.
%K nonn
%O 1,1
%A _Clark Kimberling_
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