Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%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