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%I #4 Mar 30 2012 18:56:20
%S 2,18,23,25,27,29,31,36,54,72,97,120,123,124,126,129,151,178,205,232,
%T 240,243,246,249,252,259,286,313,320,323,326,329,332,335,338,340,341,
%U 344,347,350,353,356,359,362,363,365,366,367
%N Position of n-th 3 in A031100.
%K nonn
%O 1,1
%A _Clark Kimberling_