%I #5 Sep 29 2024 23:47:45
%S 0,11,110,1100,11000,110000,1100000,11000000,11000011,110000000,
%T 110000011,110000110,1100000000,1100000011,1100000110,1100001100,
%U 11000000000,11000000011,11000000110,11000001100,11000011000,101110100011,110000000000,110000000011,110000000110
%N Sequence A115829 in binary.
%C Differs from A115806 for the first time at n = 21, where A115806(21) = 110000000000 while a(21) = 101110100011.
%F a(n) = A007088(A115829(n)).
%t Map[FromDigits[IntegerDigits[#, 2]] &, Select[Range[0, 20000], BitXor[10*#, 11*#] == 21*# &]] (* _Paolo Xausa_, Sep 29 2024 *)
%Y Cf. A007088, A115806, A115829.
%K nonn,base
%O 0,2
%A _Antti Karttunen_, Feb 01 2006