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%I #14 Jun 28 2021 04:35:56
%S 4,18,19,24,28,33,36,49,52,65,68,74,75,78,79,80,98,99,104,108,114,115,
%T 120,124,134,135,137,141,146,147,152,156,161,164,177,180,198,199,201,
%U 205,210,211,216,220,225,228,241,244,262,263,265,269,274,275,280,284
%N Numbers whose base-4 representation has the same nonzero number of 0's and 1's.
%Y Cf. A007090.
%K nonn,base,easy
%O 1,1
%A _Olivier Gérard_
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