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%I #8 Feb 12 2021 22:02:01
%S 1,2,3,4,5,6,9,10,11,14,15,16,17,20,21,22,25,26,27,36,37,38,41,42,43,
%T 46,47,57,58,59,62,63,64,65,68,69,70,80,81,84,85,86,89,90,91,100,101,
%U 102,105,106,107,110,111,144,145,148,149,150,153
%N Numbers with the property that all pairs of consecutive base-4 digits differ by 0 or 1.
%K nonn,base
%O 1,2
%A _Clark Kimberling_