A031039 - OEIS

%I #4 Mar 30 2012 18:56:20

%S 3,15,31,40,42,44,46,47,48,50,52,54,63,79,95,111,131,155,179,193,196,

%T 199,202,203,205,208,211,214,227,251,275,299,323,347,371,385,388,391,

%U 394,395,397,400,403,406,419,443,467,491,504

%N Position of n-th 3 in A031035.

%K nonn

%O 1,1

%A _Clark Kimberling_