A031328 - OEIS

%I #4 Mar 30 2012 18:56:23

%S 3,7,10,20,21,22,64,75,77,84,97,103,113,116,140,142,153,162,172,173,

%T 197,198,203,212,213,216,220,226,228,233,243,277,286,298,299,307,320,

%U 324,338,339,343,347,397,410,413,425,444,468,486

%N Position of n-th 3 in A031324.

%K nonn

%O 1,1

%A _Clark Kimberling_