%I #5 Mar 30 2012 18:56:45
%S 13,49,83,85,121,157,193,229,265,299,301,337,373,409,445,503,515,517,
%T 553,589,625,661,697,731,733,769,805,841,877,913,947,949,985,1021,
%U 1057,1093,1129,1163,1165,1201,1237,1273,1309,1345
%N Numbers n such that string 2,1 occurs in the base 6 representation of n but not of n+1.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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