A043707 - OEIS

%I #8 Jun 18 2021 23:04:19

%S 1,2,3,5,10,15,17,18,19,21,24,25,27,28,29,30,33,34,35,36,38,39,42,44,

%T 45,46,49,50,51,52,54,55,56,57,59,63,65,66,67,69,74,79,81,82,83,85,88,

%U 89,91,92,93,94,96,101,104,105,107,111,112,117

%N Numbers whose base-4 representation has an odd number of runs.

%K nonn,base

%O 1,2

%A _Clark Kimberling_