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%I #4 Mar 30 2012 18:56:21
%S 2,12,13,15,17,22,37,48,51,52,67,82,84,87,90,97,98,101,104,107,110,
%T 112,113,116,119,122,123,125,126,127,128,131,134,142,157,159,162,165,
%U 172,192,207,211,212,232,252,255,259,263,272,292
%N Position of n-th 3 in A031253.
%K nonn
%O 1,1
%A _Clark Kimberling_
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