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%I #15 Jan 04 2021 18:18:38
%S 1,2,3,5,10,15,16,20,21,22,23,26,31,32,37,40,41,42,43,47,48,53,58,60,
%T 61,62,63,64,84,85,86,87,106,127,128,149,168,169,170,171,191,192,213,
%U 234,252,253,254,255,256,320,336,340,341,342,343,346,351,362,383,426,511
%N Positive integers having distinct base-4 run lengths.
%H David A. Corneth, <a href="/A044815/b044815.txt">Table of n, a(n) for n = 1..10000</a>
%e 31 = 133_4 is in the sequence as it has distinct run lengths of same digits (1, 2). - _David A. Corneth_, Jan 04 2021
%Y Cf. A044813, A044814, A044815, A044816, A044817, A044818, A044819, A044820, A044821, A044822, A044823, A044824, A044825, A044826, A044827 (base 2 to base 16).
%K nonn,base
%O 1,2
%A _Clark Kimberling_