%I #4 Mar 30 2012 18:56:20
%S 9,23,26,28,30,37,54,75,89,92,95,96,98,117,138,159,164,167,170,180,
%T 201,222,236,239,242,243,245,264,268,271,274,277,280,283,285,286,289,
%U 292,295,298,301,304,306,307,310,311,313,314,316
%N Position of n-th 4 in A031018.
%K nonn
%O 1,1
%A _Clark Kimberling_