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Numbers n such that string 1,2 occurs in the base 4 representation of n but not of n-1.
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%I #5 Mar 30 2012 18:56:41

%S 6,22,24,38,54,70,86,88,96,118,134,150,152,166,182,198,214,216,230,

%T 246,262,278,280,294,310,326,342,344,352,374,384,454,470,472,486,502,

%U 518,534,536,550,566,582,598,600,608,630,646,662

%N Numbers n such that string 1,2 occurs in the base 4 representation of n but not of n-1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_