A031258 - OEIS

%I #4 Mar 30 2012 18:56:21

%S 8,18,19,21,31,46,54,57,60,61,76,91,93,96,106,121,129,132,135,136,137,

%T 140,143,146,149,151,152,155,158,161,164,166,167,168,170,171,184,204,

%U 215,219,223,224,244,264,267,271,284,304,315

%N Position of n-th 4 in A031253.

%K nonn

%O 1,1

%A _Clark Kimberling_